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Finding the Fourth Proportional to 530.91, 732.45 and 391.36

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Solution

The fourth proportional to 530.91, 732.45 and 391.36 is: 539.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.91 : 732.45 = 391.36 : x
  2. Step 2: Convert to fraction form
    530.91/732.45 = 391.36/x
  3. Step 3: Cross multiply
    530.91x = 732.45 × 391.36
  4. Step 4: Simplify right side
    530.91x = 286,652.64
  5. Step 5: Solve for x
    x = 286,652.64/530.91
  6. Step 6: Final answer
    x = 539.93

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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.