Home / 218,971.10-328,543.05-85,828.70

Finding the Fourth Proportional to 218,971.10, 328,543.05 and 85,828.70

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Solution

The fourth proportional to 218,971.10, 328,543.05 and 85,828.70 is: 128,776.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,971.10 : 328,543.05 = 85,828.70 : x
  2. Step 2: Convert to fraction form
    218,971.10/328,543.05 = 85,828.70/x
  3. Step 3: Cross multiply
    218,971.10x = 328,543.05 × 85,828.70
  4. Step 4: Simplify right side
    218,971.10x = 28,198,422,875.54
  5. Step 5: Solve for x
    x = 28,198,422,875.54/218,971.10
  6. Step 6: Final answer
    x = 128,776.92

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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.