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Finding the Fourth Proportional to 391,410.72, 540,146.79 and 221,677.65

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Solution

The fourth proportional to 391,410.72, 540,146.79 and 221,677.65 is: 305,915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,410.72 : 540,146.79 = 221,677.65 : x
  2. Step 2: Convert to fraction form
    391,410.72/540,146.79 = 221,677.65/x
  3. Step 3: Cross multiply
    391,410.72x = 540,146.79 × 221,677.65
  4. Step 4: Simplify right side
    391,410.72x = 119,738,471,062.24
  5. Step 5: Solve for x
    x = 119,738,471,062.24/391,410.72
  6. Step 6: Final answer
    x = 305,915.15

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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.