Home / 128,947.90-193,421.85-81,708.70

Finding the Fourth Proportional to 128,947.90, 193,421.85 and 81,708.70

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Solution

The fourth proportional to 128,947.90, 193,421.85 and 81,708.70 is: 122,563.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,947.90 : 193,421.85 = 81,708.70 : x
  2. Step 2: Convert to fraction form
    128,947.90/193,421.85 = 81,708.70/x
  3. Step 3: Cross multiply
    128,947.90x = 193,421.85 × 81,708.70
  4. Step 4: Simplify right side
    128,947.90x = 15,804,247,915.10
  5. Step 5: Solve for x
    x = 15,804,247,915.10/128,947.90
  6. Step 6: Final answer
    x = 122,563.05

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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.