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Finding the Fourth Proportional to 1,099.90, 1,649.52 and 319.72

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Solution

The fourth proportional to 1,099.90, 1,649.52 and 319.72 is: 479.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.90 : 1,649.52 = 319.72 : x
  2. Step 2: Convert to fraction form
    1,099.90/1,649.52 = 319.72/x
  3. Step 3: Cross multiply
    1,099.90x = 1,649.52 × 319.72
  4. Step 4: Simplify right side
    1,099.90x = 527,384.53
  5. Step 5: Solve for x
    x = 527,384.53/1,099.90
  6. Step 6: Final answer
    x = 479.48

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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.