Home / 128,971.29-177,981.12-71,611.41

Finding the Fourth Proportional to 128,971.29, 177,981.12 and 71,611.41

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Solution

The fourth proportional to 128,971.29, 177,981.12 and 71,611.41 is: 98,824.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,971.29 : 177,981.12 = 71,611.41 : x
  2. Step 2: Convert to fraction form
    128,971.29/177,981.12 = 71,611.41/x
  3. Step 3: Cross multiply
    128,971.29x = 177,981.12 × 71,611.41
  4. Step 4: Simplify right side
    128,971.29x = 12,745,478,956.58
  5. Step 5: Solve for x
    x = 12,745,478,956.58/128,971.29
  6. Step 6: Final answer
    x = 98,824.16

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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.