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Finding the Fourth Proportional to 485,657.40, 728,486.10 and 153,190.20

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Solution

The fourth proportional to 485,657.40, 728,486.10 and 153,190.20 is: 229,785.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,657.40 : 728,486.10 = 153,190.20 : x
  2. Step 2: Convert to fraction form
    485,657.40/728,486.10 = 153,190.20/x
  3. Step 3: Cross multiply
    485,657.40x = 728,486.10 × 153,190.20
  4. Step 4: Simplify right side
    485,657.40x = 111,596,931,356.22
  5. Step 5: Solve for x
    x = 111,596,931,356.22/485,657.40
  6. Step 6: Final answer
    x = 229,785.30

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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.