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Finding the Fourth Proportional to 391,643.39, 540,340.25 and 228,262.61

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Solution

The fourth proportional to 391,643.39, 540,340.25 and 228,262.61 is: 314,928.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,643.39 : 540,340.25 = 228,262.61 : x
  2. Step 2: Convert to fraction form
    391,643.39/540,340.25 = 228,262.61/x
  3. Step 3: Cross multiply
    391,643.39x = 540,340.25 × 228,262.61
  4. Step 4: Simplify right side
    391,643.39x = 123,339,471,910.04
  5. Step 5: Solve for x
    x = 123,339,471,910.04/391,643.39
  6. Step 6: Final answer
    x = 314,928.01

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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.