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Finding the Fourth Proportional to 391,625.40, 587,509.38 and 258,616.92

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Solution

The fourth proportional to 391,625.40, 587,509.38 and 258,616.92 is: 387,972.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,625.40 : 587,509.38 = 258,616.92 : x
  2. Step 2: Convert to fraction form
    391,625.40/587,509.38 = 258,616.92/x
  3. Step 3: Cross multiply
    391,625.40x = 587,509.38 × 258,616.92
  4. Step 4: Simplify right side
    391,625.40x = 151,939,866,326.71
  5. Step 5: Solve for x
    x = 151,939,866,326.71/391,625.40
  6. Step 6: Final answer
    x = 387,972.45

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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.