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Finding the Fourth Proportional to 945.12, 1,294.80 and 912.24

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Solution

The fourth proportional to 945.12, 1,294.80 and 912.24 is: 1,249.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.12 : 1,294.80 = 912.24 : x
  2. Step 2: Convert to fraction form
    945.12/1,294.80 = 912.24/x
  3. Step 3: Cross multiply
    945.12x = 1,294.80 × 912.24
  4. Step 4: Simplify right side
    945.12x = 1,181,168.35
  5. Step 5: Solve for x
    x = 1,181,168.35/945.12
  6. Step 6: Final answer
    x = 1,249.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.