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Finding the Fourth Proportional to 578,699.20, 868,048.80 and 485,387.20

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Solution

The fourth proportional to 578,699.20, 868,048.80 and 485,387.20 is: 728,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,699.20 : 868,048.80 = 485,387.20 : x
  2. Step 2: Convert to fraction form
    578,699.20/868,048.80 = 485,387.20/x
  3. Step 3: Cross multiply
    578,699.20x = 868,048.80 × 485,387.20
  4. Step 4: Simplify right side
    578,699.20x = 421,339,776,495.36
  5. Step 5: Solve for x
    x = 421,339,776,495.36/578,699.20
  6. Step 6: Final answer
    x = 728,080.80

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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.