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Finding the Fourth Proportional to 391,389.13, 587,280.80 and 291,749.41

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Solution

The fourth proportional to 391,389.13, 587,280.80 and 291,749.41 is: 437,771.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,389.13 : 587,280.80 = 291,749.41 : x
  2. Step 2: Convert to fraction form
    391,389.13/587,280.80 = 291,749.41/x
  3. Step 3: Cross multiply
    391,389.13x = 587,280.80 × 291,749.41
  4. Step 4: Simplify right side
    391,389.13x = 171,338,826,904.33
  5. Step 5: Solve for x
    x = 171,338,826,904.33/391,389.13
  6. Step 6: Final answer
    x = 437,771.04

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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.