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Finding the Fourth Proportional to 912.77, 1,257.43 and 726.20

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Solution

The fourth proportional to 912.77, 1,257.43 and 726.20 is: 1,000.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.77 : 1,257.43 = 726.20 : x
  2. Step 2: Convert to fraction form
    912.77/1,257.43 = 726.20/x
  3. Step 3: Cross multiply
    912.77x = 1,257.43 × 726.20
  4. Step 4: Simplify right side
    912.77x = 913,145.67
  5. Step 5: Solve for x
    x = 913,145.67/912.77
  6. Step 6: Final answer
    x = 1,000.41

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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.