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Finding the Fourth Proportional to 863.51, 1,288.89 and 754.70

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Solution

The fourth proportional to 863.51, 1,288.89 and 754.70 is: 1,126.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.51 : 1,288.89 = 754.70 : x
  2. Step 2: Convert to fraction form
    863.51/1,288.89 = 754.70/x
  3. Step 3: Cross multiply
    863.51x = 1,288.89 × 754.70
  4. Step 4: Simplify right side
    863.51x = 972,718.84
  5. Step 5: Solve for x
    x = 972,718.84/863.51
  6. Step 6: Final answer
    x = 1,126.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.