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Finding the Fourth Proportional to 81,325.80, 121,988.70 and 56,442.60

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Solution

The fourth proportional to 81,325.80, 121,988.70 and 56,442.60 is: 84,663.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,325.80 : 121,988.70 = 56,442.60 : x
  2. Step 2: Convert to fraction form
    81,325.80/121,988.70 = 56,442.60/x
  3. Step 3: Cross multiply
    81,325.80x = 121,988.70 × 56,442.60
  4. Step 4: Simplify right side
    81,325.80x = 6,885,359,398.62
  5. Step 5: Solve for x
    x = 6,885,359,398.62/81,325.80
  6. Step 6: Final answer
    x = 84,663.90

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1.5x scale

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.