Home / 128,921.09-177,908.35-71,557.07

Finding the Fourth Proportional to 128,921.09, 177,908.35 and 71,557.07

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Solution

The fourth proportional to 128,921.09, 177,908.35 and 71,557.07 is: 98,747.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.09 : 177,908.35 = 71,557.07 : x
  2. Step 2: Convert to fraction form
    128,921.09/177,908.35 = 71,557.07/x
  3. Step 3: Cross multiply
    128,921.09x = 177,908.35 × 71,557.07
  4. Step 4: Simplify right side
    128,921.09x = 12,730,600,254.53
  5. Step 5: Solve for x
    x = 12,730,600,254.53/128,921.09
  6. Step 6: Final answer
    x = 98,747.23

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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.