Home / 128,419.88-177,219.63-71,831.25

Finding the Fourth Proportional to 128,419.88, 177,219.63 and 71,831.25

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Solution

The fourth proportional to 128,419.88, 177,219.63 and 71,831.25 is: 99,127.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,419.88 : 177,219.63 = 71,831.25 : x
  2. Step 2: Convert to fraction form
    128,419.88/177,219.63 = 71,831.25/x
  3. Step 3: Cross multiply
    128,419.88x = 177,219.63 × 71,831.25
  4. Step 4: Simplify right side
    128,419.88x = 12,729,907,547.44
  5. Step 5: Solve for x
    x = 12,729,907,547.44/128,419.88
  6. Step 6: Final answer
    x = 99,127.24

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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.