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Finding the Fourth Proportional to 58.57, 87.18 and 57.70

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Solution

The fourth proportional to 58.57, 87.18 and 57.70 is: 85.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.57 : 87.18 = 57.70 : x
  2. Step 2: Convert to fraction form
    58.57/87.18 = 57.70/x
  3. Step 3: Cross multiply
    58.57x = 87.18 × 57.70
  4. Step 4: Simplify right side
    58.57x = 5,030.29
  5. Step 5: Solve for x
    x = 5,030.29/58.57
  6. Step 6: Final answer
    x = 85.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.