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Finding the Fourth Proportional to 1,123.74, 1,685.88 and 343.71

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Solution

The fourth proportional to 1,123.74, 1,685.88 and 343.71 is: 515.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.74 : 1,685.88 = 343.71 : x
  2. Step 2: Convert to fraction form
    1,123.74/1,685.88 = 343.71/x
  3. Step 3: Cross multiply
    1,123.74x = 1,685.88 × 343.71
  4. Step 4: Simplify right side
    1,123.74x = 579,453.81
  5. Step 5: Solve for x
    x = 579,453.81/1,123.74
  6. Step 6: Final answer
    x = 515.65

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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.