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Finding the Fourth Proportional to 261,964.80, 392,947.20 and 84,477.60

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Solution

The fourth proportional to 261,964.80, 392,947.20 and 84,477.60 is: 126,716.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,964.80 : 392,947.20 = 84,477.60 : x
  2. Step 2: Convert to fraction form
    261,964.80/392,947.20 = 84,477.60/x
  3. Step 3: Cross multiply
    261,964.80x = 392,947.20 × 84,477.60
  4. Step 4: Simplify right side
    261,964.80x = 33,195,236,382.72
  5. Step 5: Solve for x
    x = 33,195,236,382.72/261,964.80
  6. Step 6: Final answer
    x = 126,716.40

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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.