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Finding the Fourth Proportional to 531.35, 732.74 and 391.22

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Solution

The fourth proportional to 531.35, 732.74 and 391.22 is: 539.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.35 : 732.74 = 391.22 : x
  2. Step 2: Convert to fraction form
    531.35/732.74 = 391.22/x
  3. Step 3: Cross multiply
    531.35x = 732.74 × 391.22
  4. Step 4: Simplify right side
    531.35x = 286,656.92
  5. Step 5: Solve for x
    x = 286,656.92/531.35
  6. Step 6: Final answer
    x = 539.49

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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.