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Finding the Fourth Proportional to 66.70, 99.42 and 64.07

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Solution

The fourth proportional to 66.70, 99.42 and 64.07 is: 95.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.70 : 99.42 = 64.07 : x
  2. Step 2: Convert to fraction form
    66.70/99.42 = 64.07/x
  3. Step 3: Cross multiply
    66.70x = 99.42 × 64.07
  4. Step 4: Simplify right side
    66.70x = 6,369.34
  5. Step 5: Solve for x
    x = 6,369.34/66.70
  6. Step 6: Final answer
    x = 95.50

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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.