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Finding the Fourth Proportional to 107.30, 147.98 and 87.62

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Solution

The fourth proportional to 107.30, 147.98 and 87.62 is: 120.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.30 : 147.98 = 87.62 : x
  2. Step 2: Convert to fraction form
    107.30/147.98 = 87.62/x
  3. Step 3: Cross multiply
    107.30x = 147.98 × 87.62
  4. Step 4: Simplify right side
    107.30x = 12,966.01
  5. Step 5: Solve for x
    x = 12,966.01/107.30
  6. Step 6: Final answer
    x = 120.84

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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.