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Finding the Fourth Proportional to 114.81, 172.10 and 66.15

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Solution

The fourth proportional to 114.81, 172.10 and 66.15 is: 99.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.81 : 172.10 = 66.15 : x
  2. Step 2: Convert to fraction form
    114.81/172.10 = 66.15/x
  3. Step 3: Cross multiply
    114.81x = 172.10 × 66.15
  4. Step 4: Simplify right side
    114.81x = 11,384.08
  5. Step 5: Solve for x
    x = 11,384.08/114.81
  6. Step 6: Final answer
    x = 99.16

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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.