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Finding the Fourth Proportional to 147.90, 221.70 and 87

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Solution

The fourth proportional to 147.90, 221.70 and 87 is: 130.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.90 : 221.70 = 87 : x
  2. Step 2: Convert to fraction form
    147.90/221.70 = 87/x
  3. Step 3: Cross multiply
    147.90x = 221.70 × 87
  4. Step 4: Simplify right side
    147.90x = 19,287.90
  5. Step 5: Solve for x
    x = 19,287.90/147.90
  6. Step 6: Final answer
    x = 130.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.