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Finding the Fourth Proportional to 81,133.20, 121,699.80 and 78,022.80

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Solution

The fourth proportional to 81,133.20, 121,699.80 and 78,022.80 is: 117,034.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,133.20 : 121,699.80 = 78,022.80 : x
  2. Step 2: Convert to fraction form
    81,133.20/121,699.80 = 78,022.80/x
  3. Step 3: Cross multiply
    81,133.20x = 121,699.80 × 78,022.80
  4. Step 4: Simplify right side
    81,133.20x = 9,495,359,155.44
  5. Step 5: Solve for x
    x = 9,495,359,155.44/81,133.20
  6. Step 6: Final answer
    x = 117,034.20

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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.