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Finding the Fourth Proportional to 521,398.80, 781,903.80 and 205,790.40

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Solution

The fourth proportional to 521,398.80, 781,903.80 and 205,790.40 is: 308,608.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,398.80 : 781,903.80 = 205,790.40 : x
  2. Step 2: Convert to fraction form
    521,398.80/781,903.80 = 205,790.40/x
  3. Step 3: Cross multiply
    521,398.80x = 781,903.80 × 205,790.40
  4. Step 4: Simplify right side
    521,398.80x = 160,908,295,763.52
  5. Step 5: Solve for x
    x = 160,908,295,763.52/521,398.80
  6. Step 6: Final answer
    x = 308,608.87

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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.