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Finding the Fourth Proportional to 869.39, 1,199.91 and 816.62

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Solution

The fourth proportional to 869.39, 1,199.91 and 816.62 is: 1,127.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.39 : 1,199.91 = 816.62 : x
  2. Step 2: Convert to fraction form
    869.39/1,199.91 = 816.62/x
  3. Step 3: Cross multiply
    869.39x = 1,199.91 × 816.62
  4. Step 4: Simplify right side
    869.39x = 979,864.50
  5. Step 5: Solve for x
    x = 979,864.50/869.39
  6. Step 6: Final answer
    x = 1,127.07

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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.