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Finding the Fourth Proportional to 128,238.83, 176,978.75 and 70,876.92

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Solution

The fourth proportional to 128,238.83, 176,978.75 and 70,876.92 is: 97,815.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,238.83 : 176,978.75 = 70,876.92 : x
  2. Step 2: Convert to fraction form
    128,238.83/176,978.75 = 70,876.92/x
  3. Step 3: Cross multiply
    128,238.83x = 176,978.75 × 70,876.92
  4. Step 4: Simplify right side
    128,238.83x = 12,543,708,351.07
  5. Step 5: Solve for x
    x = 12,543,708,351.07/128,238.83
  6. Step 6: Final answer
    x = 97,815.21

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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.