Home / 128,510.39-177,344.32-71,921.77

Finding the Fourth Proportional to 128,510.39, 177,344.32 and 71,921.77

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Solution

The fourth proportional to 128,510.39, 177,344.32 and 71,921.77 is: 99,252.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510.39 : 177,344.32 = 71,921.77 : x
  2. Step 2: Convert to fraction form
    128,510.39/177,344.32 = 71,921.77/x
  3. Step 3: Cross multiply
    128,510.39x = 177,344.32 × 71,921.77
  4. Step 4: Simplify right side
    128,510.39x = 12,754,916,905.53
  5. Step 5: Solve for x
    x = 12,754,916,905.53/128,510.39
  6. Step 6: Final answer
    x = 99,252.03

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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.