Home / 128,706.47-177,418.06-90,358.44

Finding the Fourth Proportional to 128,706.47, 177,418.06 and 90,358.44

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Solution

The fourth proportional to 128,706.47, 177,418.06 and 90,358.44 is: 124,556.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.47 : 177,418.06 = 90,358.44 : x
  2. Step 2: Convert to fraction form
    128,706.47/177,418.06 = 90,358.44/x
  3. Step 3: Cross multiply
    128,706.47x = 177,418.06 × 90,358.44
  4. Step 4: Simplify right side
    128,706.47x = 16,031,219,129.43
  5. Step 5: Solve for x
    x = 16,031,219,129.43/128,706.47
  6. Step 6: Final answer
    x = 124,556.44

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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.