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Finding the Fourth Proportional to 65.71, 98.37 and 42.90

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Solution

The fourth proportional to 65.71, 98.37 and 42.90 is: 64.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.71 : 98.37 = 42.90 : x
  2. Step 2: Convert to fraction form
    65.71/98.37 = 42.90/x
  3. Step 3: Cross multiply
    65.71x = 98.37 × 42.90
  4. Step 4: Simplify right side
    65.71x = 4,220.07
  5. Step 5: Solve for x
    x = 4,220.07/65.71
  6. Step 6: Final answer
    x = 64.22

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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.