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Finding the Fourth Proportional to 130.90, 180.56 and 84.20

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Solution

The fourth proportional to 130.90, 180.56 and 84.20 is: 116.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.90 : 180.56 = 84.20 : x
  2. Step 2: Convert to fraction form
    130.90/180.56 = 84.20/x
  3. Step 3: Cross multiply
    130.90x = 180.56 × 84.20
  4. Step 4: Simplify right side
    130.90x = 15,202.71
  5. Step 5: Solve for x
    x = 15,202.71/130.90
  6. Step 6: Final answer
    x = 116.14

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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.