Home / 858,139.70-1,287,209.55-218,442.20

Finding the Fourth Proportional to 858,139.70, 1,287,209.55 and 218,442.20

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Solution

The fourth proportional to 858,139.70, 1,287,209.55 and 218,442.20 is: 327,663.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,139.70 : 1,287,209.55 = 218,442.20 : x
  2. Step 2: Convert to fraction form
    858,139.70/1,287,209.55 = 218,442.20/x
  3. Step 3: Cross multiply
    858,139.70x = 1,287,209.55 × 218,442.20
  4. Step 4: Simplify right side
    858,139.70x = 281,180,885,963.01
  5. Step 5: Solve for x
    x = 281,180,885,963.01/858,139.70
  6. Step 6: Final answer
    x = 327,663.30

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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.