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Finding the Fourth Proportional to 138,792.56, 191,533.68 and 75,130.88

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Solution

The fourth proportional to 138,792.56, 191,533.68 and 75,130.88 is: 103,680.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,792.56 : 191,533.68 = 75,130.88 : x
  2. Step 2: Convert to fraction form
    138,792.56/191,533.68 = 75,130.88/x
  3. Step 3: Cross multiply
    138,792.56x = 191,533.68 × 75,130.88
  4. Step 4: Simplify right side
    138,792.56x = 14,390,093,928.04
  5. Step 5: Solve for x
    x = 14,390,093,928.04/138,792.56
  6. Step 6: Final answer
    x = 103,680.59

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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.