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Finding the Fourth Proportional to 870.90, 1,201.67 and 516.75

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Solution

The fourth proportional to 870.90, 1,201.67 and 516.75 is: 713.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.90 : 1,201.67 = 516.75 : x
  2. Step 2: Convert to fraction form
    870.90/1,201.67 = 516.75/x
  3. Step 3: Cross multiply
    870.90x = 1,201.67 × 516.75
  4. Step 4: Simplify right side
    870.90x = 620,960.39
  5. Step 5: Solve for x
    x = 620,960.39/870.90
  6. Step 6: Final answer
    x = 713.01

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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.