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Finding the Fourth Proportional to 97.60, 145.68 and 91.52

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Solution

The fourth proportional to 97.60, 145.68 and 91.52 is: 136.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.60 : 145.68 = 91.52 : x
  2. Step 2: Convert to fraction form
    97.60/145.68 = 91.52/x
  3. Step 3: Cross multiply
    97.60x = 145.68 × 91.52
  4. Step 4: Simplify right side
    97.60x = 13,332.63
  5. Step 5: Solve for x
    x = 13,332.63/97.60
  6. Step 6: Final answer
    x = 136.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.