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Finding the Fourth Proportional to 914.46, 1,261.89 and 718.44

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Solution

The fourth proportional to 914.46, 1,261.89 and 718.44 is: 991.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.46 : 1,261.89 = 718.44 : x
  2. Step 2: Convert to fraction form
    914.46/1,261.89 = 718.44/x
  3. Step 3: Cross multiply
    914.46x = 1,261.89 × 718.44
  4. Step 4: Simplify right side
    914.46x = 906,592.25
  5. Step 5: Solve for x
    x = 906,592.25/914.46
  6. Step 6: Final answer
    x = 991.40

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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.