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Finding the Fourth Proportional to 58.39, 80.53 and 42.90

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Solution

The fourth proportional to 58.39, 80.53 and 42.90 is: 59.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.39 : 80.53 = 42.90 : x
  2. Step 2: Convert to fraction form
    58.39/80.53 = 42.90/x
  3. Step 3: Cross multiply
    58.39x = 80.53 × 42.90
  4. Step 4: Simplify right side
    58.39x = 3,454.74
  5. Step 5: Solve for x
    x = 3,454.74/58.39
  6. Step 6: Final answer
    x = 59.17

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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.