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Finding the Fourth Proportional to 1,123.72, 1,685.54 and 343.69

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Solution

The fourth proportional to 1,123.72, 1,685.54 and 343.69 is: 515.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.72 : 1,685.54 = 343.69 : x
  2. Step 2: Convert to fraction form
    1,123.72/1,685.54 = 343.69/x
  3. Step 3: Cross multiply
    1,123.72x = 1,685.54 × 343.69
  4. Step 4: Simplify right side
    1,123.72x = 579,303.24
  5. Step 5: Solve for x
    x = 579,303.24/1,123.72
  6. Step 6: Final answer
    x = 515.52

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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.