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Finding the Fourth Proportional to 859.31, 1,289.42 and 655.19

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Solution

The fourth proportional to 859.31, 1,289.42 and 655.19 is: 983.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.31 : 1,289.42 = 655.19 : x
  2. Step 2: Convert to fraction form
    859.31/1,289.42 = 655.19/x
  3. Step 3: Cross multiply
    859.31x = 1,289.42 × 655.19
  4. Step 4: Simplify right side
    859.31x = 844,812.66
  5. Step 5: Solve for x
    x = 844,812.66/859.31
  6. Step 6: Final answer
    x = 983.13

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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.