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Finding the Fourth Proportional to 156,471.40, 215,930.08 and 84,851.20

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Solution

The fourth proportional to 156,471.40, 215,930.08 and 84,851.20 is: 117,094.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,471.40 : 215,930.08 = 84,851.20 : x
  2. Step 2: Convert to fraction form
    156,471.40/215,930.08 = 84,851.20/x
  3. Step 3: Cross multiply
    156,471.40x = 215,930.08 × 84,851.20
  4. Step 4: Simplify right side
    156,471.40x = 18,321,926,404.10
  5. Step 5: Solve for x
    x = 18,321,926,404.10/156,471.40
  6. Step 6: Final answer
    x = 117,094.41

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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.