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Finding the Fourth Proportional to 480,091.20, 720,136.80 and 391,444.80

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Solution

The fourth proportional to 480,091.20, 720,136.80 and 391,444.80 is: 587,167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,091.20 : 720,136.80 = 391,444.80 : x
  2. Step 2: Convert to fraction form
    480,091.20/720,136.80 = 391,444.80/x
  3. Step 3: Cross multiply
    480,091.20x = 720,136.80 × 391,444.80
  4. Step 4: Simplify right side
    480,091.20x = 281,893,805,648.64
  5. Step 5: Solve for x
    x = 281,893,805,648.64/480,091.20
  6. Step 6: Final answer
    x = 587,167.20

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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.