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Finding the Fourth Proportional to 128,328.25, 177,049.12 and 77,321.79

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Solution

The fourth proportional to 128,328.25, 177,049.12 and 77,321.79 is: 106,677.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,328.25 : 177,049.12 = 77,321.79 : x
  2. Step 2: Convert to fraction form
    128,328.25/177,049.12 = 77,321.79/x
  3. Step 3: Cross multiply
    128,328.25x = 177,049.12 × 77,321.79
  4. Step 4: Simplify right side
    128,328.25x = 13,689,754,610.53
  5. Step 5: Solve for x
    x = 13,689,754,610.53/128,328.25
  6. Step 6: Final answer
    x = 106,677.64

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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.