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Finding the Fourth Proportional to 391,389.63, 587,281.55 and 291,749.91

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Solution

The fourth proportional to 391,389.63, 587,281.55 and 291,749.91 is: 437,771.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,389.63 : 587,281.55 = 291,749.91 : x
  2. Step 2: Convert to fraction form
    391,389.63/587,281.55 = 291,749.91/x
  3. Step 3: Cross multiply
    391,389.63x = 587,281.55 × 291,749.91
  4. Step 4: Simplify right side
    391,389.63x = 171,339,337,898.41
  5. Step 5: Solve for x
    x = 171,339,337,898.41/391,389.63
  6. Step 6: Final answer
    x = 437,771.79

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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.