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Finding the Fourth Proportional to 138,515.30, 207,254.55 and 91,859.30

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Solution

The fourth proportional to 138,515.30, 207,254.55 and 91,859.30 is: 137,445.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,515.30 : 207,254.55 = 91,859.30 : x
  2. Step 2: Convert to fraction form
    138,515.30/207,254.55 = 91,859.30/x
  3. Step 3: Cross multiply
    138,515.30x = 207,254.55 × 91,859.30
  4. Step 4: Simplify right side
    138,515.30x = 19,038,257,884.82
  5. Step 5: Solve for x
    x = 19,038,257,884.82/138,515.30
  6. Step 6: Final answer
    x = 137,445.16

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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.