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Finding the Fourth Proportional to 485,367.40, 728,051.10 and 317,405.80

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Solution

The fourth proportional to 485,367.40, 728,051.10 and 317,405.80 is: 476,108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,367.40 : 728,051.10 = 317,405.80 : x
  2. Step 2: Convert to fraction form
    485,367.40/728,051.10 = 317,405.80/x
  3. Step 3: Cross multiply
    485,367.40x = 728,051.10 × 317,405.80
  4. Step 4: Simplify right side
    485,367.40x = 231,087,641,836.38
  5. Step 5: Solve for x
    x = 231,087,641,836.38/485,367.40
  6. Step 6: Final answer
    x = 476,108.70

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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.