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Finding the Fourth Proportional to 485,588.40, 728,382.60 and 153,121.20

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Solution

The fourth proportional to 485,588.40, 728,382.60 and 153,121.20 is: 229,681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,588.40 : 728,382.60 = 153,121.20 : x
  2. Step 2: Convert to fraction form
    485,588.40/728,382.60 = 153,121.20/x
  3. Step 3: Cross multiply
    485,588.40x = 728,382.60 × 153,121.20
  4. Step 4: Simplify right side
    485,588.40x = 111,530,817,771.12
  5. Step 5: Solve for x
    x = 111,530,817,771.12/485,588.40
  6. Step 6: Final answer
    x = 229,681.80

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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.