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Finding the Fourth Proportional to 859.34, 1,286.13 and 713.90

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Solution

The fourth proportional to 859.34, 1,286.13 and 713.90 is: 1,068.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.34 : 1,286.13 = 713.90 : x
  2. Step 2: Convert to fraction form
    859.34/1,286.13 = 713.90/x
  3. Step 3: Cross multiply
    859.34x = 1,286.13 × 713.90
  4. Step 4: Simplify right side
    859.34x = 918,168.21
  5. Step 5: Solve for x
    x = 918,168.21/859.34
  6. Step 6: Final answer
    x = 1,068.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.