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Finding the Fourth Proportional to 128,672.50, 177,575.13 and 71,310.63

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Solution

The fourth proportional to 128,672.50, 177,575.13 and 71,310.63 is: 98,412.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,672.50 : 177,575.13 = 71,310.63 : x
  2. Step 2: Convert to fraction form
    128,672.50/177,575.13 = 71,310.63/x
  3. Step 3: Cross multiply
    128,672.50x = 177,575.13 × 71,310.63
  4. Step 4: Simplify right side
    128,672.50x = 12,662,993,326.48
  5. Step 5: Solve for x
    x = 12,662,993,326.48/128,672.50
  6. Step 6: Final answer
    x = 98,412.59

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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.