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Finding the Fourth Proportional to 391,178.84, 586,859.78 and 121,292.78

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Solution

The fourth proportional to 391,178.84, 586,859.78 and 121,292.78 is: 181,967.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,178.84 : 586,859.78 = 121,292.78 : x
  2. Step 2: Convert to fraction form
    391,178.84/586,859.78 = 121,292.78/x
  3. Step 3: Cross multiply
    391,178.84x = 586,859.78 × 121,292.78
  4. Step 4: Simplify right side
    391,178.84x = 71,181,851,555.32
  5. Step 5: Solve for x
    x = 71,181,851,555.32/391,178.84
  6. Step 6: Final answer
    x = 181,967.54

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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.