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Finding the Fourth Proportional to 912.01, 1,257.25 and 725.58

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Solution

The fourth proportional to 912.01, 1,257.25 and 725.58 is: 1,000.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.01 : 1,257.25 = 725.58 : x
  2. Step 2: Convert to fraction form
    912.01/1,257.25 = 725.58/x
  3. Step 3: Cross multiply
    912.01x = 1,257.25 × 725.58
  4. Step 4: Simplify right side
    912.01x = 912,235.46
  5. Step 5: Solve for x
    x = 912,235.46/912.01
  6. Step 6: Final answer
    x = 1,000.25

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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.