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Finding the Fourth Proportional to 62.34, 86.00 and 39.87

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Solution

The fourth proportional to 62.34, 86.00 and 39.87 is: 55.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.34 : 86.00 = 39.87 : x
  2. Step 2: Convert to fraction form
    62.34/86.00 = 39.87/x
  3. Step 3: Cross multiply
    62.34x = 86.00 × 39.87
  4. Step 4: Simplify right side
    62.34x = 3,428.51
  5. Step 5: Solve for x
    x = 3,428.51/62.34
  6. Step 6: Final answer
    x = 55.00

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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.