Home / 81,123.40-121,685.10-53,129.80

Finding the Fourth Proportional to 81,123.40, 121,685.10 and 53,129.80

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Solution

The fourth proportional to 81,123.40, 121,685.10 and 53,129.80 is: 79,694.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,123.40 : 121,685.10 = 53,129.80 : x
  2. Step 2: Convert to fraction form
    81,123.40/121,685.10 = 53,129.80/x
  3. Step 3: Cross multiply
    81,123.40x = 121,685.10 × 53,129.80
  4. Step 4: Simplify right side
    81,123.40x = 6,465,105,025.98
  5. Step 5: Solve for x
    x = 6,465,105,025.98/81,123.40
  6. Step 6: Final answer
    x = 79,694.70

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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.