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Finding the Fourth Proportional to 138,718.56, 191,433.12 and 75,057.60

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Solution

The fourth proportional to 138,718.56, 191,433.12 and 75,057.60 is: 103,580.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.56 : 191,433.12 = 75,057.60 : x
  2. Step 2: Convert to fraction form
    138,718.56/191,433.12 = 75,057.60/x
  3. Step 3: Cross multiply
    138,718.56x = 191,433.12 × 75,057.60
  4. Step 4: Simplify right side
    138,718.56x = 14,368,510,547.71
  5. Step 5: Solve for x
    x = 14,368,510,547.71/138,718.56
  6. Step 6: Final answer
    x = 103,580.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.