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Finding the Fourth Proportional to 521,569.80, 782,646.30 and 221,999.40

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Solution

The fourth proportional to 521,569.80, 782,646.30 and 221,999.40 is: 333,123.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,569.80 : 782,646.30 = 221,999.40 : x
  2. Step 2: Convert to fraction form
    521,569.80/782,646.30 = 221,999.40/x
  3. Step 3: Cross multiply
    521,569.80x = 782,646.30 × 221,999.40
  4. Step 4: Simplify right side
    521,569.80x = 173,747,009,012.22
  5. Step 5: Solve for x
    x = 173,747,009,012.22/521,569.80
  6. Step 6: Final answer
    x = 333,123.22

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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.