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Finding the Fourth Proportional to 71.74, 99.05 and 51.04

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Solution

The fourth proportional to 71.74, 99.05 and 51.04 is: 70.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.74 : 99.05 = 51.04 : x
  2. Step 2: Convert to fraction form
    71.74/99.05 = 51.04/x
  3. Step 3: Cross multiply
    71.74x = 99.05 × 51.04
  4. Step 4: Simplify right side
    71.74x = 5,055.38
  5. Step 5: Solve for x
    x = 5,055.38/71.74
  6. Step 6: Final answer
    x = 70.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.