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Finding the Fourth Proportional to 859.86, 1,289.88 and 282.78

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Solution

The fourth proportional to 859.86, 1,289.88 and 282.78 is: 424.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.86 : 1,289.88 = 282.78 : x
  2. Step 2: Convert to fraction form
    859.86/1,289.88 = 282.78/x
  3. Step 3: Cross multiply
    859.86x = 1,289.88 × 282.78
  4. Step 4: Simplify right side
    859.86x = 364,752.27
  5. Step 5: Solve for x
    x = 364,752.27/859.86
  6. Step 6: Final answer
    x = 424.20

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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.