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Finding the Fourth Proportional to 391,490.20, 587,235.30 and 339,002.20

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Solution

The fourth proportional to 391,490.20, 587,235.30 and 339,002.20 is: 508,503.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,490.20 : 587,235.30 = 339,002.20 : x
  2. Step 2: Convert to fraction form
    391,490.20/587,235.30 = 339,002.20/x
  3. Step 3: Cross multiply
    391,490.20x = 587,235.30 × 339,002.20
  4. Step 4: Simplify right side
    391,490.20x = 199,074,058,617.66
  5. Step 5: Solve for x
    x = 199,074,058,617.66/391,490.20
  6. Step 6: Final answer
    x = 508,503.30

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1.5x scale

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.