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Finding the Fourth Proportional to 1,278.48, 1,764.24 and 718.80

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Solution

The fourth proportional to 1,278.48, 1,764.24 and 718.80 is: 991.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.48 : 1,764.24 = 718.80 : x
  2. Step 2: Convert to fraction form
    1,278.48/1,764.24 = 718.80/x
  3. Step 3: Cross multiply
    1,278.48x = 1,764.24 × 718.80
  4. Step 4: Simplify right side
    1,278.48x = 1,268,135.71
  5. Step 5: Solve for x
    x = 1,268,135.71/1,278.48
  6. Step 6: Final answer
    x = 991.91

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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.