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Finding the Fourth Proportional to 391,169.70, 587,143.35 and 191,715.30

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Solution

The fourth proportional to 391,169.70, 587,143.35 and 191,715.30 is: 287,763.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,169.70 : 587,143.35 = 191,715.30 : x
  2. Step 2: Convert to fraction form
    391,169.70/587,143.35 = 191,715.30/x
  3. Step 3: Cross multiply
    391,169.70x = 587,143.35 × 191,715.30
  4. Step 4: Simplify right side
    391,169.70x = 112,564,363,488.26
  5. Step 5: Solve for x
    x = 112,564,363,488.26/391,169.70
  6. Step 6: Final answer
    x = 287,763.50

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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.