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Finding the Fourth Proportional to 391,639.92, 586,188.90 and 211,474.86

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Solution

The fourth proportional to 391,639.92, 586,188.90 and 211,474.86 is: 316,526.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,639.92 : 586,188.90 = 211,474.86 : x
  2. Step 2: Convert to fraction form
    391,639.92/586,188.90 = 211,474.86/x
  3. Step 3: Cross multiply
    391,639.92x = 586,188.90 × 211,474.86
  4. Step 4: Simplify right side
    391,639.92x = 123,964,215,561.05
  5. Step 5: Solve for x
    x = 123,964,215,561.05/391,639.92
  6. Step 6: Final answer
    x = 316,526.00

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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.