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Finding the Fourth Proportional to 52.92, 72.99 and 31.07

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Solution

The fourth proportional to 52.92, 72.99 and 31.07 is: 42.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.92 : 72.99 = 31.07 : x
  2. Step 2: Convert to fraction form
    52.92/72.99 = 31.07/x
  3. Step 3: Cross multiply
    52.92x = 72.99 × 31.07
  4. Step 4: Simplify right side
    52.92x = 2,267.43
  5. Step 5: Solve for x
    x = 2,267.43/52.92
  6. Step 6: Final answer
    x = 42.85

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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.