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Finding the Fourth Proportional to 391,806.20, 587,709.30 and 368,186.60

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Solution

The fourth proportional to 391,806.20, 587,709.30 and 368,186.60 is: 552,279.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,806.20 : 587,709.30 = 368,186.60 : x
  2. Step 2: Convert to fraction form
    391,806.20/587,709.30 = 368,186.60/x
  3. Step 3: Cross multiply
    391,806.20x = 587,709.30 × 368,186.60
  4. Step 4: Simplify right side
    391,806.20x = 216,386,688,955.38
  5. Step 5: Solve for x
    x = 216,386,688,955.38/391,806.20
  6. Step 6: Final answer
    x = 552,279.90

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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.