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Finding the Fourth Proportional to 1,101.90, 1,650.15 and 638.58

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Solution

The fourth proportional to 1,101.90, 1,650.15 and 638.58 is: 956.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.90 : 1,650.15 = 638.58 : x
  2. Step 2: Convert to fraction form
    1,101.90/1,650.15 = 638.58/x
  3. Step 3: Cross multiply
    1,101.90x = 1,650.15 × 638.58
  4. Step 4: Simplify right side
    1,101.90x = 1,053,752.79
  5. Step 5: Solve for x
    x = 1,053,752.79/1,101.90
  6. Step 6: Final answer
    x = 956.31

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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.