Home / 128,921.88-177,915.06-75,210.51

Finding the Fourth Proportional to 128,921.88, 177,915.06 and 75,210.51

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Solution

The fourth proportional to 128,921.88, 177,915.06 and 75,210.51 is: 103,792.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.88 : 177,915.06 = 75,210.51 : x
  2. Step 2: Convert to fraction form
    128,921.88/177,915.06 = 75,210.51/x
  3. Step 3: Cross multiply
    128,921.88x = 177,915.06 × 75,210.51
  4. Step 4: Simplify right side
    128,921.88x = 13,381,082,399.28
  5. Step 5: Solve for x
    x = 13,381,082,399.28/128,921.88
  6. Step 6: Final answer
    x = 103,792.18

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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.