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Finding the Fourth Proportional to 1,485.36, 2,049.75 and 813.15

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Solution

The fourth proportional to 1,485.36, 2,049.75 and 813.15 is: 1,122.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.36 : 2,049.75 = 813.15 : x
  2. Step 2: Convert to fraction form
    1,485.36/2,049.75 = 813.15/x
  3. Step 3: Cross multiply
    1,485.36x = 2,049.75 × 813.15
  4. Step 4: Simplify right side
    1,485.36x = 1,666,754.21
  5. Step 5: Solve for x
    x = 1,666,754.21/1,485.36
  6. Step 6: Final answer
    x = 1,122.12

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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.