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Finding the Fourth Proportional to 1,330.38, 1,994.20 and 508.43

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Solution

The fourth proportional to 1,330.38, 1,994.20 and 508.43 is: 762.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.38 : 1,994.20 = 508.43 : x
  2. Step 2: Convert to fraction form
    1,330.38/1,994.20 = 508.43/x
  3. Step 3: Cross multiply
    1,330.38x = 1,994.20 × 508.43
  4. Step 4: Simplify right side
    1,330.38x = 1,013,917.68
  5. Step 5: Solve for x
    x = 1,013,917.68/1,330.38
  6. Step 6: Final answer
    x = 762.13

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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.