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Finding the Fourth Proportional to 1,278.37, 1,764.04 and 718.76

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Solution

The fourth proportional to 1,278.37, 1,764.04 and 718.76 is: 991.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.37 : 1,764.04 = 718.76 : x
  2. Step 2: Convert to fraction form
    1,278.37/1,764.04 = 718.76/x
  3. Step 3: Cross multiply
    1,278.37x = 1,764.04 × 718.76
  4. Step 4: Simplify right side
    1,278.37x = 1,267,921.39
  5. Step 5: Solve for x
    x = 1,267,921.39/1,278.37
  6. Step 6: Final answer
    x = 991.83

Related Problems

Find fourth proportional to 639.19, 882.02 and 359.38
Half scale
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Double scale
Find fourth proportional to 1,279.37, 1,765.42 and 719.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.