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Finding the Fourth Proportional to 931.17, 1,285.20 and 538.32

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Solution

The fourth proportional to 931.17, 1,285.20 and 538.32 is: 742.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.17 : 1,285.20 = 538.32 : x
  2. Step 2: Convert to fraction form
    931.17/1,285.20 = 538.32/x
  3. Step 3: Cross multiply
    931.17x = 1,285.20 × 538.32
  4. Step 4: Simplify right side
    931.17x = 691,848.86
  5. Step 5: Solve for x
    x = 691,848.86/931.17
  6. Step 6: Final answer
    x = 742.99

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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.