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Finding the Fourth Proportional to 391,870.91, 540,896.78 and 255,925.40

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Solution

The fourth proportional to 391,870.91, 540,896.78 and 255,925.40 is: 353,252.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,870.91 : 540,896.78 = 255,925.40 : x
  2. Step 2: Convert to fraction form
    391,870.91/540,896.78 = 255,925.40/x
  3. Step 3: Cross multiply
    391,870.91x = 540,896.78 × 255,925.40
  4. Step 4: Simplify right side
    391,870.91x = 138,429,222,715.54
  5. Step 5: Solve for x
    x = 138,429,222,715.54/391,870.91
  6. Step 6: Final answer
    x = 353,252.10

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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.