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Finding the Fourth Proportional to 853.76, 1,178.12 and 480.76

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Solution

The fourth proportional to 853.76, 1,178.12 and 480.76 is: 663.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.76 : 1,178.12 = 480.76 : x
  2. Step 2: Convert to fraction form
    853.76/1,178.12 = 480.76/x
  3. Step 3: Cross multiply
    853.76x = 1,178.12 × 480.76
  4. Step 4: Simplify right side
    853.76x = 566,392.97
  5. Step 5: Solve for x
    x = 566,392.97/853.76
  6. Step 6: Final answer
    x = 663.41

Related Problems

Find fourth proportional to 426.88, 589.06 and 240.38
Half scale
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Double scale
Find fourth proportional to 854.76, 1,179.50 and 481.76
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.