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Finding the Fourth Proportional to 408,020.40, 612,088.20 and 127,508.40

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Solution

The fourth proportional to 408,020.40, 612,088.20 and 127,508.40 is: 191,280.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,020.40 : 612,088.20 = 127,508.40 : x
  2. Step 2: Convert to fraction form
    408,020.40/612,088.20 = 127,508.40/x
  3. Step 3: Cross multiply
    408,020.40x = 612,088.20 × 127,508.40
  4. Step 4: Simplify right side
    408,020.40x = 78,046,387,040.88
  5. Step 5: Solve for x
    x = 78,046,387,040.88/408,020.40
  6. Step 6: Final answer
    x = 191,280.60

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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.