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Finding the Fourth Proportional to 391,419.48, 540,158.85 and 221,686.41

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Solution

The fourth proportional to 391,419.48, 540,158.85 and 221,686.41 is: 305,927.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,419.48 : 540,158.85 = 221,686.41 : x
  2. Step 2: Convert to fraction form
    391,419.48/540,158.85 = 221,686.41/x
  3. Step 3: Cross multiply
    391,419.48x = 540,158.85 × 221,686.41
  4. Step 4: Simplify right side
    391,419.48x = 119,745,876,286.23
  5. Step 5: Solve for x
    x = 119,745,876,286.23/391,419.48
  6. Step 6: Final answer
    x = 305,927.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.