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Finding the Fourth Proportional to 62.65, 86.49 and 40.85

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Solution

The fourth proportional to 62.65, 86.49 and 40.85 is: 56.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.65 : 86.49 = 40.85 : x
  2. Step 2: Convert to fraction form
    62.65/86.49 = 40.85/x
  3. Step 3: Cross multiply
    62.65x = 86.49 × 40.85
  4. Step 4: Simplify right side
    62.65x = 3,533.61
  5. Step 5: Solve for x
    x = 3,533.61/62.65
  6. Step 6: Final answer
    x = 56.40

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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.