Home / 429,920.80-643,897.72-205,439.04

Finding the Fourth Proportional to 429,920.80, 643,897.72 and 205,439.04

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Solution

The fourth proportional to 429,920.80, 643,897.72 and 205,439.04 is: 307,688.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,920.80 : 643,897.72 = 205,439.04 : x
  2. Step 2: Convert to fraction form
    429,920.80/643,897.72 = 205,439.04/x
  3. Step 3: Cross multiply
    429,920.80x = 643,897.72 × 205,439.04
  4. Step 4: Simplify right side
    429,920.80x = 132,281,729,454.99
  5. Step 5: Solve for x
    x = 132,281,729,454.99/429,920.80
  6. Step 6: Final answer
    x = 307,688.60

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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.