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Finding the Fourth Proportional to 485,513,999.70, 728,270,999.55 and 212,884,766.70

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Solution

The fourth proportional to 485,513,999.70, 728,270,999.55 and 212,884,766.70 is: 319,327,150.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,513,999.70 : 728,270,999.55 = 212,884,766.70 : x
  2. Step 2: Convert to fraction form
    485,513,999.70/728,270,999.55 = 212,884,766.70/x
  3. Step 3: Cross multiply
    485,513,999.70x = 728,270,999.55 × 212,884,766.70
  4. Step 4: Simplify right side
    485,513,999.70x = 155,037,801,833,577,536
  5. Step 5: Solve for x
    x = 155,037,801,833,577,536/485,513,999.70
  6. Step 6: Final answer
    x = 319,327,150.05

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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.