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Finding the Fourth Proportional to 859.86, 1,282.86 and 818.64

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Solution

The fourth proportional to 859.86, 1,282.86 and 818.64 is: 1,221.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.86 : 1,282.86 = 818.64 : x
  2. Step 2: Convert to fraction form
    859.86/1,282.86 = 818.64/x
  3. Step 3: Cross multiply
    859.86x = 1,282.86 × 818.64
  4. Step 4: Simplify right side
    859.86x = 1,050,200.51
  5. Step 5: Solve for x
    x = 1,050,200.51/859.86
  6. Step 6: Final answer
    x = 1,221.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.