Home / 425,981.70-639,490.95-215,511.30

Finding the Fourth Proportional to 425,981.70, 639,490.95 and 215,511.30

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Solution

The fourth proportional to 425,981.70, 639,490.95 and 215,511.30 is: 323,529.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,981.70 : 639,490.95 = 215,511.30 : x
  2. Step 2: Convert to fraction form
    425,981.70/639,490.95 = 215,511.30/x
  3. Step 3: Cross multiply
    425,981.70x = 639,490.95 × 215,511.30
  4. Step 4: Simplify right side
    425,981.70x = 137,817,525,972.74
  5. Step 5: Solve for x
    x = 137,817,525,972.74/425,981.70
  6. Step 6: Final answer
    x = 323,529.22

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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.