Home / 858,129.70-1,287,194.55-218,432.20

Finding the Fourth Proportional to 858,129.70, 1,287,194.55 and 218,432.20

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Solution

The fourth proportional to 858,129.70, 1,287,194.55 and 218,432.20 is: 327,648.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,129.70 : 1,287,194.55 = 218,432.20 : x
  2. Step 2: Convert to fraction form
    858,129.70/1,287,194.55 = 218,432.20/x
  3. Step 3: Cross multiply
    858,129.70x = 1,287,194.55 × 218,432.20
  4. Step 4: Simplify right side
    858,129.70x = 281,164,737,384.51
  5. Step 5: Solve for x
    x = 281,164,737,384.51/858,129.70
  6. Step 6: Final answer
    x = 327,648.30

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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.