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Finding the Fourth Proportional to 128,243.63, 176,976.27 and 71,655

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Solution

The fourth proportional to 128,243.63, 176,976.27 and 71,655 is: 98,883.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,243.63 : 176,976.27 = 71,655 : x
  2. Step 2: Convert to fraction form
    128,243.63/176,976.27 = 71,655/x
  3. Step 3: Cross multiply
    128,243.63x = 176,976.27 × 71,655
  4. Step 4: Simplify right side
    128,243.63x = 12,681,234,626.85
  5. Step 5: Solve for x
    x = 12,681,234,626.85/128,243.63
  6. Step 6: Final answer
    x = 98,883.93

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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.