Home / 128,925.06-177,919.65-72,340.62

Finding the Fourth Proportional to 128,925.06, 177,919.65 and 72,340.62

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Solution

The fourth proportional to 128,925.06, 177,919.65 and 72,340.62 is: 99,831.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,925.06 : 177,919.65 = 72,340.62 : x
  2. Step 2: Convert to fraction form
    128,925.06/177,919.65 = 72,340.62/x
  3. Step 3: Cross multiply
    128,925.06x = 177,919.65 × 72,340.62
  4. Step 4: Simplify right side
    128,925.06x = 12,870,817,791.18
  5. Step 5: Solve for x
    x = 12,870,817,791.18/128,925.06
  6. Step 6: Final answer
    x = 99,831.78

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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.