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Finding the Fourth Proportional to 1,121.39, 1,681.98 and 299.63

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Solution

The fourth proportional to 1,121.39, 1,681.98 and 299.63 is: 449.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.39 : 1,681.98 = 299.63 : x
  2. Step 2: Convert to fraction form
    1,121.39/1,681.98 = 299.63/x
  3. Step 3: Cross multiply
    1,121.39x = 1,681.98 × 299.63
  4. Step 4: Simplify right side
    1,121.39x = 503,970.17
  5. Step 5: Solve for x
    x = 503,970.17/1,121.39
  6. Step 6: Final answer
    x = 449.42

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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.