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Finding the Fourth Proportional to 1,330.72, 1,995.78 and 508.70

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Solution

The fourth proportional to 1,330.72, 1,995.78 and 508.70 is: 762.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.72 : 1,995.78 = 508.70 : x
  2. Step 2: Convert to fraction form
    1,330.72/1,995.78 = 508.70/x
  3. Step 3: Cross multiply
    1,330.72x = 1,995.78 × 508.70
  4. Step 4: Simplify right side
    1,330.72x = 1,015,253.29
  5. Step 5: Solve for x
    x = 1,015,253.29/1,330.72
  6. Step 6: Final answer
    x = 762.94

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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.