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Finding the Fourth Proportional to 611,757.60, 917,636.40 and 485,786.40

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Solution

The fourth proportional to 611,757.60, 917,636.40 and 485,786.40 is: 728,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,757.60 : 917,636.40 = 485,786.40 : x
  2. Step 2: Convert to fraction form
    611,757.60/917,636.40 = 485,786.40/x
  3. Step 3: Cross multiply
    611,757.60x = 917,636.40 × 485,786.40
  4. Step 4: Simplify right side
    611,757.60x = 445,775,283,264.96
  5. Step 5: Solve for x
    x = 445,775,283,264.96/611,757.60
  6. Step 6: Final answer
    x = 728,679.60

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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.