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Finding the Fourth Proportional to 869.94, 1,311.19 and 816.89

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Solution

The fourth proportional to 869.94, 1,311.19 and 816.89 is: 1,231.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.94 : 1,311.19 = 816.89 : x
  2. Step 2: Convert to fraction form
    869.94/1,311.19 = 816.89/x
  3. Step 3: Cross multiply
    869.94x = 1,311.19 × 816.89
  4. Step 4: Simplify right side
    869.94x = 1,071,089.40
  5. Step 5: Solve for x
    x = 1,071,089.40/869.94
  6. Step 6: Final answer
    x = 1,231.22

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1.5x scale

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.