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Finding the Fourth Proportional to 58.12, 87.38 and 56.90

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Solution

The fourth proportional to 58.12, 87.38 and 56.90 is: 85.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.12 : 87.38 = 56.90 : x
  2. Step 2: Convert to fraction form
    58.12/87.38 = 56.90/x
  3. Step 3: Cross multiply
    58.12x = 87.38 × 56.90
  4. Step 4: Simplify right side
    58.12x = 4,972.07
  5. Step 5: Solve for x
    x = 4,972.07/58.12
  6. Step 6: Final answer
    x = 85.55

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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.