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Finding the Fourth Proportional to 1,004.20, 1,505.78 and 354.84

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Solution

The fourth proportional to 1,004.20, 1,505.78 and 354.84 is: 532.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.20 : 1,505.78 = 354.84 : x
  2. Step 2: Convert to fraction form
    1,004.20/1,505.78 = 354.84/x
  3. Step 3: Cross multiply
    1,004.20x = 1,505.78 × 354.84
  4. Step 4: Simplify right side
    1,004.20x = 534,310.98
  5. Step 5: Solve for x
    x = 534,310.98/1,004.20
  6. Step 6: Final answer
    x = 532.08

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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.