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Finding the Fourth Proportional to 408,732.80, 613,118.40 and 128,259.20

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Solution

The fourth proportional to 408,732.80, 613,118.40 and 128,259.20 is: 192,394.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,732.80 : 613,118.40 = 128,259.20 : x
  2. Step 2: Convert to fraction form
    408,732.80/613,118.40 = 128,259.20/x
  3. Step 3: Cross multiply
    408,732.80x = 613,118.40 × 128,259.20
  4. Step 4: Simplify right side
    408,732.80x = 78,638,075,489.28
  5. Step 5: Solve for x
    x = 78,638,075,489.28/408,732.80
  6. Step 6: Final answer
    x = 192,394.82

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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.