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Finding the Fourth Proportional to 725.64, 1,088.54 and 286.90

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Solution

The fourth proportional to 725.64, 1,088.54 and 286.90 is: 430.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.64 : 1,088.54 = 286.90 : x
  2. Step 2: Convert to fraction form
    725.64/1,088.54 = 286.90/x
  3. Step 3: Cross multiply
    725.64x = 1,088.54 × 286.90
  4. Step 4: Simplify right side
    725.64x = 312,302.13
  5. Step 5: Solve for x
    x = 312,302.13/725.64
  6. Step 6: Final answer
    x = 430.38

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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.