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Finding the Fourth Proportional to 1,121.76, 1,681.38 and 809.10

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Solution

The fourth proportional to 1,121.76, 1,681.38 and 809.10 is: 1,212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.76 : 1,681.38 = 809.10 : x
  2. Step 2: Convert to fraction form
    1,121.76/1,681.38 = 809.10/x
  3. Step 3: Cross multiply
    1,121.76x = 1,681.38 × 809.10
  4. Step 4: Simplify right side
    1,121.76x = 1,360,404.56
  5. Step 5: Solve for x
    x = 1,360,404.56/1,121.76
  6. Step 6: Final answer
    x = 1,212.74

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.