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Finding the Fourth Proportional to 845.40, 1,268.20 and 297.72

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Solution

The fourth proportional to 845.40, 1,268.20 and 297.72 is: 446.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.40 : 1,268.20 = 297.72 : x
  2. Step 2: Convert to fraction form
    845.40/1,268.20 = 297.72/x
  3. Step 3: Cross multiply
    845.40x = 1,268.20 × 297.72
  4. Step 4: Simplify right side
    845.40x = 377,568.50
  5. Step 5: Solve for x
    x = 377,568.50/845.40
  6. Step 6: Final answer
    x = 446.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.