Home / 128,556.72-192,757.32-86,877.36

Finding the Fourth Proportional to 128,556.72, 192,757.32 and 86,877.36

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Solution

The fourth proportional to 128,556.72, 192,757.32 and 86,877.36 is: 130,263.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,556.72 : 192,757.32 = 86,877.36 : x
  2. Step 2: Convert to fraction form
    128,556.72/192,757.32 = 86,877.36/x
  3. Step 3: Cross multiply
    128,556.72x = 192,757.32 × 86,877.36
  4. Step 4: Simplify right side
    128,556.72x = 16,746,247,082.28
  5. Step 5: Solve for x
    x = 16,746,247,082.28/128,556.72
  6. Step 6: Final answer
    x = 130,263.49

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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.