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Finding the Fourth Proportional to 66.23, 99.70 and 51.87

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Solution

The fourth proportional to 66.23, 99.70 and 51.87 is: 78.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.23 : 99.70 = 51.87 : x
  2. Step 2: Convert to fraction form
    66.23/99.70 = 51.87/x
  3. Step 3: Cross multiply
    66.23x = 99.70 × 51.87
  4. Step 4: Simplify right side
    66.23x = 5,171.18
  5. Step 5: Solve for x
    x = 5,171.18/66.23
  6. Step 6: Final answer
    x = 78.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.