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Finding the Fourth Proportional to 66.40, 99.01 and 64.13

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Solution

The fourth proportional to 66.40, 99.01 and 64.13 is: 95.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.40 : 99.01 = 64.13 : x
  2. Step 2: Convert to fraction form
    66.40/99.01 = 64.13/x
  3. Step 3: Cross multiply
    66.40x = 99.01 × 64.13
  4. Step 4: Simplify right side
    66.40x = 6,349.10
  5. Step 5: Solve for x
    x = 6,349.10/66.40
  6. Step 6: Final answer
    x = 95.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.