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Finding the Fourth Proportional to 665,086.20, 997,775.10 and 215,730.60

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Solution

The fourth proportional to 665,086.20, 997,775.10 and 215,730.60 is: 323,643.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,086.20 : 997,775.10 = 215,730.60 : x
  2. Step 2: Convert to fraction form
    665,086.20/997,775.10 = 215,730.60/x
  3. Step 3: Cross multiply
    665,086.20x = 997,775.10 × 215,730.60
  4. Step 4: Simplify right side
    665,086.20x = 215,250,620,988.06
  5. Step 5: Solve for x
    x = 215,250,620,988.06/665,086.20
  6. Step 6: Final answer
    x = 323,643.19

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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.