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Finding the Fourth Proportional to 1,121.99, 1,549.53 and 807.57

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Solution

The fourth proportional to 1,121.99, 1,549.53 and 807.57 is: 1,115.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.99 : 1,549.53 = 807.57 : x
  2. Step 2: Convert to fraction form
    1,121.99/1,549.53 = 807.57/x
  3. Step 3: Cross multiply
    1,121.99x = 1,549.53 × 807.57
  4. Step 4: Simplify right side
    1,121.99x = 1,251,353.94
  5. Step 5: Solve for x
    x = 1,251,353.94/1,121.99
  6. Step 6: Final answer
    x = 1,115.30

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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.