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Finding the Fourth Proportional to 65.72, 98.70 and 40.08

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Solution

The fourth proportional to 65.72, 98.70 and 40.08 is: 60.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.72 : 98.70 = 40.08 : x
  2. Step 2: Convert to fraction form
    65.72/98.70 = 40.08/x
  3. Step 3: Cross multiply
    65.72x = 98.70 × 40.08
  4. Step 4: Simplify right side
    65.72x = 3,955.90
  5. Step 5: Solve for x
    x = 3,955.90/65.72
  6. Step 6: Final answer
    x = 60.19

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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.