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Finding the Fourth Proportional to 839,875.80, 1,259,813.70 and 278,910.30

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Solution

The fourth proportional to 839,875.80, 1,259,813.70 and 278,910.30 is: 418,365.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,875.80 : 1,259,813.70 = 278,910.30 : x
  2. Step 2: Convert to fraction form
    839,875.80/1,259,813.70 = 278,910.30/x
  3. Step 3: Cross multiply
    839,875.80x = 1,259,813.70 × 278,910.30
  4. Step 4: Simplify right side
    839,875.80x = 351,375,017,011.11
  5. Step 5: Solve for x
    x = 351,375,017,011.11/839,875.80
  6. Step 6: Final answer
    x = 418,365.45

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Similar ratio
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1.5x scale

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.