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Finding the Fourth Proportional to 845.60, 1,170.12 and 721.06

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Solution

The fourth proportional to 845.60, 1,170.12 and 721.06 is: 997.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.60 : 1,170.12 = 721.06 : x
  2. Step 2: Convert to fraction form
    845.60/1,170.12 = 721.06/x
  3. Step 3: Cross multiply
    845.60x = 1,170.12 × 721.06
  4. Step 4: Simplify right side
    845.60x = 843,726.73
  5. Step 5: Solve for x
    x = 843,726.73/845.60
  6. Step 6: Final answer
    x = 997.78

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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.