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Finding the Fourth Proportional to 391,525.40, 587,288.10 and 328,539.80

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Solution

The fourth proportional to 391,525.40, 587,288.10 and 328,539.80 is: 492,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,525.40 : 587,288.10 = 328,539.80 : x
  2. Step 2: Convert to fraction form
    391,525.40/587,288.10 = 328,539.80/x
  3. Step 3: Cross multiply
    391,525.40x = 587,288.10 × 328,539.80
  4. Step 4: Simplify right side
    391,525.40x = 192,947,514,916.38
  5. Step 5: Solve for x
    x = 192,947,514,916.38/391,525.40
  6. Step 6: Final answer
    x = 492,809.70

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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.