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Finding the Fourth Proportional to 1,335.30, 2,001.90 and 513.78

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Solution

The fourth proportional to 1,335.30, 2,001.90 and 513.78 is: 770.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.30 : 2,001.90 = 513.78 : x
  2. Step 2: Convert to fraction form
    1,335.30/2,001.90 = 513.78/x
  3. Step 3: Cross multiply
    1,335.30x = 2,001.90 × 513.78
  4. Step 4: Simplify right side
    1,335.30x = 1,028,536.18
  5. Step 5: Solve for x
    x = 1,028,536.18/1,335.30
  6. Step 6: Final answer
    x = 770.27

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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.