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Finding the Fourth Proportional to 890.58, 1,221.18 and 859.68

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Solution

The fourth proportional to 890.58, 1,221.18 and 859.68 is: 1,178.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.58 : 1,221.18 = 859.68 : x
  2. Step 2: Convert to fraction form
    890.58/1,221.18 = 859.68/x
  3. Step 3: Cross multiply
    890.58x = 1,221.18 × 859.68
  4. Step 4: Simplify right side
    890.58x = 1,049,824.02
  5. Step 5: Solve for x
    x = 1,049,824.02/890.58
  6. Step 6: Final answer
    x = 1,178.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.