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Finding the Fourth Proportional to 138,605.92, 191,276.28 and 74,943.76

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Solution

The fourth proportional to 138,605.92, 191,276.28 and 74,943.76 is: 103,422.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,605.92 : 191,276.28 = 74,943.76 : x
  2. Step 2: Convert to fraction form
    138,605.92/191,276.28 = 74,943.76/x
  3. Step 3: Cross multiply
    138,605.92x = 191,276.28 × 74,943.76
  4. Step 4: Simplify right side
    138,605.92x = 14,334,963,622.01
  5. Step 5: Solve for x
    x = 14,334,963,622.01/138,605.92
  6. Step 6: Final answer
    x = 103,422.45

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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.