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Finding the Fourth Proportional to 138,928.76, 191,720.48 and 75,266.40

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Solution

The fourth proportional to 138,928.76, 191,720.48 and 75,266.40 is: 103,866.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,928.76 : 191,720.48 = 75,266.40 : x
  2. Step 2: Convert to fraction form
    138,928.76/191,720.48 = 75,266.40/x
  3. Step 3: Cross multiply
    138,928.76x = 191,720.48 × 75,266.40
  4. Step 4: Simplify right side
    138,928.76x = 14,430,110,335.87
  5. Step 5: Solve for x
    x = 14,430,110,335.87/138,928.76
  6. Step 6: Final answer
    x = 103,866.98

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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.