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Finding the Fourth Proportional to 912.62, 1,260.21 and 715.79

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Solution

The fourth proportional to 912.62, 1,260.21 and 715.79 is: 988.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.62 : 1,260.21 = 715.79 : x
  2. Step 2: Convert to fraction form
    912.62/1,260.21 = 715.79/x
  3. Step 3: Cross multiply
    912.62x = 1,260.21 × 715.79
  4. Step 4: Simplify right side
    912.62x = 902,045.72
  5. Step 5: Solve for x
    x = 902,045.72/912.62
  6. Step 6: Final answer
    x = 988.41

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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.