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Finding the Fourth Proportional to 665,139.20, 997,854.60 and 215,783.60

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Solution

The fourth proportional to 665,139.20, 997,854.60 and 215,783.60 is: 323,722.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,139.20 : 997,854.60 = 215,783.60 : x
  2. Step 2: Convert to fraction form
    665,139.20/997,854.60 = 215,783.60/x
  3. Step 3: Cross multiply
    665,139.20x = 997,854.60 × 215,783.60
  4. Step 4: Simplify right side
    665,139.20x = 215,320,657,864.56
  5. Step 5: Solve for x
    x = 215,320,657,864.56/665,139.20
  6. Step 6: Final answer
    x = 323,722.70

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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.