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Finding the Fourth Proportional to 72,811.97, 100,453.09 and 42,587.63

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Solution

The fourth proportional to 72,811.97, 100,453.09 and 42,587.63 is: 58,754.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,811.97 : 100,453.09 = 42,587.63 : x
  2. Step 2: Convert to fraction form
    72,811.97/100,453.09 = 42,587.63/x
  3. Step 3: Cross multiply
    72,811.97x = 100,453.09 × 42,587.63
  4. Step 4: Simplify right side
    72,811.97x = 4,278,059,029.28
  5. Step 5: Solve for x
    x = 4,278,059,029.28/72,811.97
  6. Step 6: Final answer
    x = 58,754.89

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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.