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Finding the Fourth Proportional to 1,004.67, 1,505.78 and 517.45

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Solution

The fourth proportional to 1,004.67, 1,505.78 and 517.45 is: 775.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.67 : 1,505.78 = 517.45 : x
  2. Step 2: Convert to fraction form
    1,004.67/1,505.78 = 517.45/x
  3. Step 3: Cross multiply
    1,004.67x = 1,505.78 × 517.45
  4. Step 4: Simplify right side
    1,004.67x = 779,167.15
  5. Step 5: Solve for x
    x = 779,167.15/1,004.67
  6. Step 6: Final answer
    x = 775.55

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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.