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Finding the Fourth Proportional to 62.70, 86.54 and 40.87

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Solution

The fourth proportional to 62.70, 86.54 and 40.87 is: 56.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.70 : 86.54 = 40.87 : x
  2. Step 2: Convert to fraction form
    62.70/86.54 = 40.87/x
  3. Step 3: Cross multiply
    62.70x = 86.54 × 40.87
  4. Step 4: Simplify right side
    62.70x = 3,536.89
  5. Step 5: Solve for x
    x = 3,536.89/62.70
  6. Step 6: Final answer
    x = 56.41

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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.