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Finding the Fourth Proportional to 1,115.22, 1,671.72 and 384.30

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Solution

The fourth proportional to 1,115.22, 1,671.72 and 384.30 is: 576.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.22 : 1,671.72 = 384.30 : x
  2. Step 2: Convert to fraction form
    1,115.22/1,671.72 = 384.30/x
  3. Step 3: Cross multiply
    1,115.22x = 1,671.72 × 384.30
  4. Step 4: Simplify right side
    1,115.22x = 642,442.00
  5. Step 5: Solve for x
    x = 642,442.00/1,115.22
  6. Step 6: Final answer
    x = 576.07

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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.