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Finding the Fourth Proportional to 128,292.32, 177,040.34 and 71,708.96

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Solution

The fourth proportional to 128,292.32, 177,040.34 and 71,708.96 is: 98,956.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,292.32 : 177,040.34 = 71,708.96 : x
  2. Step 2: Convert to fraction form
    128,292.32/177,040.34 = 71,708.96/x
  3. Step 3: Cross multiply
    128,292.32x = 177,040.34 × 71,708.96
  4. Step 4: Simplify right side
    128,292.32x = 12,695,378,348.51
  5. Step 5: Solve for x
    x = 12,695,378,348.51/128,292.32
  6. Step 6: Final answer
    x = 98,956.65

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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.