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Finding the Fourth Proportional to 858,896.10, 1,288,344.15 and 660,219.30

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Solution

The fourth proportional to 858,896.10, 1,288,344.15 and 660,219.30 is: 990,328.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,896.10 : 1,288,344.15 = 660,219.30 : x
  2. Step 2: Convert to fraction form
    858,896.10/1,288,344.15 = 660,219.30/x
  3. Step 3: Cross multiply
    858,896.10x = 1,288,344.15 × 660,219.30
  4. Step 4: Simplify right side
    858,896.10x = 850,589,672,872.10
  5. Step 5: Solve for x
    x = 850,589,672,872.10/858,896.10
  6. Step 6: Final answer
    x = 990,328.95

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Double scale
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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.