Home / 128,691.06-177,600.93-72,120.66

Finding the Fourth Proportional to 128,691.06, 177,600.93 and 72,120.66

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Solution

The fourth proportional to 128,691.06, 177,600.93 and 72,120.66 is: 99,530.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,691.06 : 177,600.93 = 72,120.66 : x
  2. Step 2: Convert to fraction form
    128,691.06/177,600.93 = 72,120.66/x
  3. Step 3: Cross multiply
    128,691.06x = 177,600.93 × 72,120.66
  4. Step 4: Simplify right side
    128,691.06x = 12,808,696,288.21
  5. Step 5: Solve for x
    x = 12,808,696,288.21/128,691.06
  6. Step 6: Final answer
    x = 99,530.58

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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.