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Finding the Fourth Proportional to 1,008.99, 1,393.74 and 813.24

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Solution

The fourth proportional to 1,008.99, 1,393.74 and 813.24 is: 1,123.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.99 : 1,393.74 = 813.24 : x
  2. Step 2: Convert to fraction form
    1,008.99/1,393.74 = 813.24/x
  3. Step 3: Cross multiply
    1,008.99x = 1,393.74 × 813.24
  4. Step 4: Simplify right side
    1,008.99x = 1,133,445.12
  5. Step 5: Solve for x
    x = 1,133,445.12/1,008.99
  6. Step 6: Final answer
    x = 1,123.35

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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.