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Finding the Fourth Proportional to 128,618.63, 177,494.45 and 71,259.76

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Solution

The fourth proportional to 128,618.63, 177,494.45 and 71,259.76 is: 98,338.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,618.63 : 177,494.45 = 71,259.76 : x
  2. Step 2: Convert to fraction form
    128,618.63/177,494.45 = 71,259.76/x
  3. Step 3: Cross multiply
    128,618.63x = 177,494.45 × 71,259.76
  4. Step 4: Simplify right side
    128,618.63x = 12,648,211,908.33
  5. Step 5: Solve for x
    x = 12,648,211,908.33/128,618.63
  6. Step 6: Final answer
    x = 98,338.88

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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.