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Finding the Fourth Proportional to 859.59, 1,289.39 and 282.47

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Solution

The fourth proportional to 859.59, 1,289.39 and 282.47 is: 423.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.59 : 1,289.39 = 282.47 : x
  2. Step 2: Convert to fraction form
    859.59/1,289.39 = 282.47/x
  3. Step 3: Cross multiply
    859.59x = 1,289.39 × 282.47
  4. Step 4: Simplify right side
    859.59x = 364,206.13
  5. Step 5: Solve for x
    x = 364,206.13/859.59
  6. Step 6: Final answer
    x = 423.70

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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.