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Finding the Fourth Proportional to 865,990.80, 1,299,015.90 and 266,947.20

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Solution

The fourth proportional to 865,990.80, 1,299,015.90 and 266,947.20 is: 400,429.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,990.80 : 1,299,015.90 = 266,947.20 : x
  2. Step 2: Convert to fraction form
    865,990.80/1,299,015.90 = 266,947.20/x
  3. Step 3: Cross multiply
    865,990.80x = 1,299,015.90 × 266,947.20
  4. Step 4: Simplify right side
    865,990.80x = 346,768,657,260.48
  5. Step 5: Solve for x
    x = 346,768,657,260.48/865,990.80
  6. Step 6: Final answer
    x = 400,429.96

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Double scale
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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.