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Finding the Fourth Proportional to 480,042.80, 720,064.20 and 426,129.20

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Solution

The fourth proportional to 480,042.80, 720,064.20 and 426,129.20 is: 639,193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,042.80 : 720,064.20 = 426,129.20 : x
  2. Step 2: Convert to fraction form
    480,042.80/720,064.20 = 426,129.20/x
  3. Step 3: Cross multiply
    480,042.80x = 720,064.20 × 426,129.20
  4. Step 4: Simplify right side
    480,042.80x = 306,840,381,494.64
  5. Step 5: Solve for x
    x = 306,840,381,494.64/480,042.80
  6. Step 6: Final answer
    x = 639,193.80

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Similar ratio
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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.