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Finding the Fourth Proportional to 859.04, 1,288.79 and 612.55

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Solution

The fourth proportional to 859.04, 1,288.79 and 612.55 is: 918.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.04 : 1,288.79 = 612.55 : x
  2. Step 2: Convert to fraction form
    859.04/1,288.79 = 612.55/x
  3. Step 3: Cross multiply
    859.04x = 1,288.79 × 612.55
  4. Step 4: Simplify right side
    859.04x = 789,442.03
  5. Step 5: Solve for x
    x = 789,442.03/859.04
  6. Step 6: Final answer
    x = 918.99

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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.