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Finding the Fourth Proportional to 485,640.60, 728,460.90 and 438,401.40

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Solution

The fourth proportional to 485,640.60, 728,460.90 and 438,401.40 is: 657,602.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,640.60 : 728,460.90 = 438,401.40 : x
  2. Step 2: Convert to fraction form
    485,640.60/728,460.90 = 438,401.40/x
  3. Step 3: Cross multiply
    485,640.60x = 728,460.90 × 438,401.40
  4. Step 4: Simplify right side
    485,640.60x = 319,358,278,405.26
  5. Step 5: Solve for x
    x = 319,358,278,405.26/485,640.60
  6. Step 6: Final answer
    x = 657,602.10

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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.