Home / 858,128.20-1,287,192.30-218,430.70

Finding the Fourth Proportional to 858,128.20, 1,287,192.30 and 218,430.70

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Solution

The fourth proportional to 858,128.20, 1,287,192.30 and 218,430.70 is: 327,646.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,128.20 : 1,287,192.30 = 218,430.70 : x
  2. Step 2: Convert to fraction form
    858,128.20/1,287,192.30 = 218,430.70/x
  3. Step 3: Cross multiply
    858,128.20x = 1,287,192.30 × 218,430.70
  4. Step 4: Simplify right side
    858,128.20x = 281,162,315,123.61
  5. Step 5: Solve for x
    x = 281,162,315,123.61/858,128.20
  6. Step 6: Final answer
    x = 327,646.05

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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.