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Finding the Fourth Proportional to 1,068.71, 1,603.13 and 338.30

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Solution

The fourth proportional to 1,068.71, 1,603.13 and 338.30 is: 507.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.71 : 1,603.13 = 338.30 : x
  2. Step 2: Convert to fraction form
    1,068.71/1,603.13 = 338.30/x
  3. Step 3: Cross multiply
    1,068.71x = 1,603.13 × 338.30
  4. Step 4: Simplify right side
    1,068.71x = 542,331.71
  5. Step 5: Solve for x
    x = 542,331.71/1,068.71
  6. Step 6: Final answer
    x = 507.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.