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Finding the Fourth Proportional to 84,007.80, 126,011.70 and 81,156.60

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Solution

The fourth proportional to 84,007.80, 126,011.70 and 81,156.60 is: 121,734.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,007.80 : 126,011.70 = 81,156.60 : x
  2. Step 2: Convert to fraction form
    84,007.80/126,011.70 = 81,156.60/x
  3. Step 3: Cross multiply
    84,007.80x = 126,011.70 × 81,156.60
  4. Step 4: Simplify right side
    84,007.80x = 10,226,681,132.22
  5. Step 5: Solve for x
    x = 10,226,681,132.22/84,007.80
  6. Step 6: Final answer
    x = 121,734.90

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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.