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Finding the Fourth Proportional to 1,098.72, 1,648.08 and 513.72

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Solution

The fourth proportional to 1,098.72, 1,648.08 and 513.72 is: 770.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.72 : 1,648.08 = 513.72 : x
  2. Step 2: Convert to fraction form
    1,098.72/1,648.08 = 513.72/x
  3. Step 3: Cross multiply
    1,098.72x = 1,648.08 × 513.72
  4. Step 4: Simplify right side
    1,098.72x = 846,651.66
  5. Step 5: Solve for x
    x = 846,651.66/1,098.72
  6. Step 6: Final answer
    x = 770.58

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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.