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Finding the Fourth Proportional to 912.12, 1,257.35 and 715.29

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Solution

The fourth proportional to 912.12, 1,257.35 and 715.29 is: 986.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.12 : 1,257.35 = 715.29 : x
  2. Step 2: Convert to fraction form
    912.12/1,257.35 = 715.29/x
  3. Step 3: Cross multiply
    912.12x = 1,257.35 × 715.29
  4. Step 4: Simplify right side
    912.12x = 899,366.31
  5. Step 5: Solve for x
    x = 899,366.31/912.12
  6. Step 6: Final answer
    x = 986.02

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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.