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Finding the Fourth Proportional to 130.95, 180.43 and 87.21

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Solution

The fourth proportional to 130.95, 180.43 and 87.21 is: 120.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.95 : 180.43 = 87.21 : x
  2. Step 2: Convert to fraction form
    130.95/180.43 = 87.21/x
  3. Step 3: Cross multiply
    130.95x = 180.43 × 87.21
  4. Step 4: Simplify right side
    130.95x = 15,734.86
  5. Step 5: Solve for x
    x = 15,734.86/130.95
  6. Step 6: Final answer
    x = 120.16

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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.