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Finding the Fourth Proportional to 52.86, 72.68 and 42.90

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Solution

The fourth proportional to 52.86, 72.68 and 42.90 is: 58.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.86 : 72.68 = 42.90 : x
  2. Step 2: Convert to fraction form
    52.86/72.68 = 42.90/x
  3. Step 3: Cross multiply
    52.86x = 72.68 × 42.90
  4. Step 4: Simplify right side
    52.86x = 3,117.97
  5. Step 5: Solve for x
    x = 3,117.97/52.86
  6. Step 6: Final answer
    x = 58.99

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.