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Finding the Fourth Proportional to 485,764.20, 728,646.30 and 153,340.20

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Solution

The fourth proportional to 485,764.20, 728,646.30 and 153,340.20 is: 230,010.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,764.20 : 728,646.30 = 153,340.20 : x
  2. Step 2: Convert to fraction form
    485,764.20/728,646.30 = 153,340.20/x
  3. Step 3: Cross multiply
    485,764.20x = 728,646.30 × 153,340.20
  4. Step 4: Simplify right side
    485,764.20x = 111,730,769,371.26
  5. Step 5: Solve for x
    x = 111,730,769,371.26/485,764.20
  6. Step 6: Final answer
    x = 230,010.30

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Double scale
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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.