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Finding the Fourth Proportional to 128,275.30, 177,030.82 and 74,556.88

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Solution

The fourth proportional to 128,275.30, 177,030.82 and 74,556.88 is: 102,894.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,275.30 : 177,030.82 = 74,556.88 : x
  2. Step 2: Convert to fraction form
    128,275.30/177,030.82 = 74,556.88/x
  3. Step 3: Cross multiply
    128,275.30x = 177,030.82 × 74,556.88
  4. Step 4: Simplify right side
    128,275.30x = 13,198,865,332.18
  5. Step 5: Solve for x
    x = 13,198,865,332.18/128,275.30
  6. Step 6: Final answer
    x = 102,894.83

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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.