Home / 218,742.32-328,140.84-85,605.38

Finding the Fourth Proportional to 218,742.32, 328,140.84 and 85,605.38

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Solution

The fourth proportional to 218,742.32, 328,140.84 and 85,605.38 is: 128,418.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,742.32 : 328,140.84 = 85,605.38 : x
  2. Step 2: Convert to fraction form
    218,742.32/328,140.84 = 85,605.38/x
  3. Step 3: Cross multiply
    218,742.32x = 328,140.84 × 85,605.38
  4. Step 4: Simplify right side
    218,742.32x = 28,090,621,301.72
  5. Step 5: Solve for x
    x = 28,090,621,301.72/218,742.32
  6. Step 6: Final answer
    x = 128,418.78

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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.