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Finding the Fourth Proportional to 816.60, 1,231.48 and 805.68

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Solution

The fourth proportional to 816.60, 1,231.48 and 805.68 is: 1,215.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.60 : 1,231.48 = 805.68 : x
  2. Step 2: Convert to fraction form
    816.60/1,231.48 = 805.68/x
  3. Step 3: Cross multiply
    816.60x = 1,231.48 × 805.68
  4. Step 4: Simplify right side
    816.60x = 992,178.81
  5. Step 5: Solve for x
    x = 992,178.81/816.60
  6. Step 6: Final answer
    x = 1,215.01

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.