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Finding the Fourth Proportional to 869.23, 1,197.01 and 813.65

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Solution

The fourth proportional to 869.23, 1,197.01 and 813.65 is: 1,120.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.23 : 1,197.01 = 813.65 : x
  2. Step 2: Convert to fraction form
    869.23/1,197.01 = 813.65/x
  3. Step 3: Cross multiply
    869.23x = 1,197.01 × 813.65
  4. Step 4: Simplify right side
    869.23x = 973,942.22
  5. Step 5: Solve for x
    x = 973,942.22/869.23
  6. Step 6: Final answer
    x = 1,120.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.