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Finding the Fourth Proportional to 72.47, 99.89 and 55.00

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Solution

The fourth proportional to 72.47, 99.89 and 55.00 is: 75.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.47 : 99.89 = 55.00 : x
  2. Step 2: Convert to fraction form
    72.47/99.89 = 55.00/x
  3. Step 3: Cross multiply
    72.47x = 99.89 × 55.00
  4. Step 4: Simplify right side
    72.47x = 5,493.84
  5. Step 5: Solve for x
    x = 5,493.84/72.47
  6. Step 6: Final answer
    x = 75.81

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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.