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Finding the Fourth Proportional to 1,005.52, 1,508.28 and 427.60

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Solution

The fourth proportional to 1,005.52, 1,508.28 and 427.60 is: 641.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.52 : 1,508.28 = 427.60 : x
  2. Step 2: Convert to fraction form
    1,005.52/1,508.28 = 427.60/x
  3. Step 3: Cross multiply
    1,005.52x = 1,508.28 × 427.60
  4. Step 4: Simplify right side
    1,005.52x = 644,940.53
  5. Step 5: Solve for x
    x = 644,940.53/1,005.52
  6. Step 6: Final answer
    x = 641.40

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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.