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Finding the Fourth Proportional to 521,017.80, 781,332.30 and 205,409.40

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Solution

The fourth proportional to 521,017.80, 781,332.30 and 205,409.40 is: 308,037.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,017.80 : 781,332.30 = 205,409.40 : x
  2. Step 2: Convert to fraction form
    521,017.80/781,332.30 = 205,409.40/x
  3. Step 3: Cross multiply
    521,017.80x = 781,332.30 × 205,409.40
  4. Step 4: Simplify right side
    521,017.80x = 160,492,998,943.62
  5. Step 5: Solve for x
    x = 160,492,998,943.62/521,017.80
  6. Step 6: Final answer
    x = 308,037.46

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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.