Home / 128,872.18-177,831.75-72,272.62

Finding the Fourth Proportional to 128,872.18, 177,831.75 and 72,272.62

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Solution

The fourth proportional to 128,872.18, 177,831.75 and 72,272.62 is: 99,729.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,872.18 : 177,831.75 = 72,272.62 : x
  2. Step 2: Convert to fraction form
    128,872.18/177,831.75 = 72,272.62/x
  3. Step 3: Cross multiply
    128,872.18x = 177,831.75 × 72,272.62
  4. Step 4: Simplify right side
    128,872.18x = 12,852,366,491.69
  5. Step 5: Solve for x
    x = 12,852,366,491.69/128,872.18
  6. Step 6: Final answer
    x = 99,729.57

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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.