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Finding the Fourth Proportional to 138,518.30, 207,259.05 and 91,862.30

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Solution

The fourth proportional to 138,518.30, 207,259.05 and 91,862.30 is: 137,449.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,518.30 : 207,259.05 = 91,862.30 : x
  2. Step 2: Convert to fraction form
    138,518.30/207,259.05 = 91,862.30/x
  3. Step 3: Cross multiply
    138,518.30x = 207,259.05 × 91,862.30
  4. Step 4: Simplify right side
    138,518.30x = 19,039,293,028.82
  5. Step 5: Solve for x
    x = 19,039,293,028.82/138,518.30
  6. Step 6: Final answer
    x = 137,449.66

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1.5x scale

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.