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Finding the Fourth Proportional to 130.61, 180.30 and 84.05

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Solution

The fourth proportional to 130.61, 180.30 and 84.05 is: 116.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.61 : 180.30 = 84.05 : x
  2. Step 2: Convert to fraction form
    130.61/180.30 = 84.05/x
  3. Step 3: Cross multiply
    130.61x = 180.30 × 84.05
  4. Step 4: Simplify right side
    130.61x = 15,154.30
  5. Step 5: Solve for x
    x = 15,154.30/130.61
  6. Step 6: Final answer
    x = 116.02

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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.