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Finding the Fourth Proportional to 1,098.70, 1,648.05 and 661.30

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Solution

The fourth proportional to 1,098.70, 1,648.05 and 661.30 is: 991.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.70 : 1,648.05 = 661.30 : x
  2. Step 2: Convert to fraction form
    1,098.70/1,648.05 = 661.30/x
  3. Step 3: Cross multiply
    1,098.70x = 1,648.05 × 661.30
  4. Step 4: Simplify right side
    1,098.70x = 1,089,855.47
  5. Step 5: Solve for x
    x = 1,089,855.47/1,098.70
  6. Step 6: Final answer
    x = 991.95

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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.