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Finding the Fourth Proportional to 78.01, 116.80 and 66.46

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Solution

The fourth proportional to 78.01, 116.80 and 66.46 is: 99.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.01 : 116.80 = 66.46 : x
  2. Step 2: Convert to fraction form
    78.01/116.80 = 66.46/x
  3. Step 3: Cross multiply
    78.01x = 116.80 × 66.46
  4. Step 4: Simplify right side
    78.01x = 7,762.53
  5. Step 5: Solve for x
    x = 7,762.53/78.01
  6. Step 6: Final answer
    x = 99.51

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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.