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Finding the Fourth Proportional to 643,063.38, 887,363.49 and 371,218.85

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Solution

The fourth proportional to 643,063.38, 887,363.49 and 371,218.85 is: 512,245.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,063.38 : 887,363.49 = 371,218.85 : x
  2. Step 2: Convert to fraction form
    643,063.38/887,363.49 = 371,218.85/x
  3. Step 3: Cross multiply
    643,063.38x = 887,363.49 × 371,218.85
  4. Step 4: Simplify right side
    643,063.38x = 329,406,054,289.79
  5. Step 5: Solve for x
    x = 329,406,054,289.79/643,063.38
  6. Step 6: Final answer
    x = 512,245.08

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.