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Finding the Fourth Proportional to 97.80, 135.02 and 59

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Solution

The fourth proportional to 97.80, 135.02 and 59 is: 81.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.80 : 135.02 = 59 : x
  2. Step 2: Convert to fraction form
    97.80/135.02 = 59/x
  3. Step 3: Cross multiply
    97.80x = 135.02 × 59
  4. Step 4: Simplify right side
    97.80x = 7,966.18
  5. Step 5: Solve for x
    x = 7,966.18/97.80
  6. Step 6: Final answer
    x = 81.45

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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.