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Finding the Fourth Proportional to 611,627.10, 917,440.65 and 485,655.90

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Solution

The fourth proportional to 611,627.10, 917,440.65 and 485,655.90 is: 728,483.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,627.10 : 917,440.65 = 485,655.90 : x
  2. Step 2: Convert to fraction form
    611,627.10/917,440.65 = 485,655.90/x
  3. Step 3: Cross multiply
    611,627.10x = 917,440.65 × 485,655.90
  4. Step 4: Simplify right side
    611,627.10x = 445,560,464,572.34
  5. Step 5: Solve for x
    x = 445,560,464,572.34/611,627.10
  6. Step 6: Final answer
    x = 728,483.85

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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.