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Finding the Fourth Proportional to 408,043.40, 612,122.70 and 127,531.40

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Solution

The fourth proportional to 408,043.40, 612,122.70 and 127,531.40 is: 191,315.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,043.40 : 612,122.70 = 127,531.40 : x
  2. Step 2: Convert to fraction form
    408,043.40/612,122.70 = 127,531.40/x
  3. Step 3: Cross multiply
    408,043.40x = 612,122.70 × 127,531.40
  4. Step 4: Simplify right side
    408,043.40x = 78,064,864,902.78
  5. Step 5: Solve for x
    x = 78,064,864,902.78/408,043.40
  6. Step 6: Final answer
    x = 191,315.10

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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.