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Finding the Fourth Proportional to 1,115.37, 1,672.65 and 384.75

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Solution

The fourth proportional to 1,115.37, 1,672.65 and 384.75 is: 576.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.37 : 1,672.65 = 384.75 : x
  2. Step 2: Convert to fraction form
    1,115.37/1,672.65 = 384.75/x
  3. Step 3: Cross multiply
    1,115.37x = 1,672.65 × 384.75
  4. Step 4: Simplify right side
    1,115.37x = 643,552.09
  5. Step 5: Solve for x
    x = 643,552.09/1,115.37
  6. Step 6: Final answer
    x = 576.99

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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.