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Finding the Fourth Proportional to 96.93, 145.91 and 87

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Solution

The fourth proportional to 96.93, 145.91 and 87 is: 130.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.93 : 145.91 = 87 : x
  2. Step 2: Convert to fraction form
    96.93/145.91 = 87/x
  3. Step 3: Cross multiply
    96.93x = 145.91 × 87
  4. Step 4: Simplify right side
    96.93x = 12,693.74
  5. Step 5: Solve for x
    x = 12,693.74/96.93
  6. Step 6: Final answer
    x = 130.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.