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Finding the Fourth Proportional to 217,113.57, 325,781.55 and 103,390.11

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Solution

The fourth proportional to 217,113.57, 325,781.55 and 103,390.11 is: 155,138.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,113.57 : 325,781.55 = 103,390.11 : x
  2. Step 2: Convert to fraction form
    217,113.57/325,781.55 = 103,390.11/x
  3. Step 3: Cross multiply
    217,113.57x = 325,781.55 × 103,390.11
  4. Step 4: Simplify right side
    217,113.57x = 33,682,590,290.47
  5. Step 5: Solve for x
    x = 33,682,590,290.47/217,113.57
  6. Step 6: Final answer
    x = 155,138.12

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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.