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Finding the Fourth Proportional to 426,139.80, 639,209.70 and 248,555.40

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Solution

The fourth proportional to 426,139.80, 639,209.70 and 248,555.40 is: 372,833.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,139.80 : 639,209.70 = 248,555.40 : x
  2. Step 2: Convert to fraction form
    426,139.80/639,209.70 = 248,555.40/x
  3. Step 3: Cross multiply
    426,139.80x = 639,209.70 × 248,555.40
  4. Step 4: Simplify right side
    426,139.80x = 158,879,022,667.38
  5. Step 5: Solve for x
    x = 158,879,022,667.38/426,139.80
  6. Step 6: Final answer
    x = 372,833.10

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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.