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Finding the Fourth Proportional to 58.47, 80.72 and 42.90

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Solution

The fourth proportional to 58.47, 80.72 and 42.90 is: 59.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.47 : 80.72 = 42.90 : x
  2. Step 2: Convert to fraction form
    58.47/80.72 = 42.90/x
  3. Step 3: Cross multiply
    58.47x = 80.72 × 42.90
  4. Step 4: Simplify right side
    58.47x = 3,462.67
  5. Step 5: Solve for x
    x = 3,462.67/58.47
  6. Step 6: Final answer
    x = 59.22

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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.