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Finding the Fourth Proportional to 58.15, 87.14 and 42.90

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Solution

The fourth proportional to 58.15, 87.14 and 42.90 is: 64.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.15 : 87.14 = 42.90 : x
  2. Step 2: Convert to fraction form
    58.15/87.14 = 42.90/x
  3. Step 3: Cross multiply
    58.15x = 87.14 × 42.90
  4. Step 4: Simplify right side
    58.15x = 3,738.09
  5. Step 5: Solve for x
    x = 3,738.09/58.15
  6. Step 6: Final answer
    x = 64.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.