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Finding the Fourth Proportional to 1,285.17, 1,928.28 and 669.31

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Solution

The fourth proportional to 1,285.17, 1,928.28 and 669.31 is: 1,004.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.17 : 1,928.28 = 669.31 : x
  2. Step 2: Convert to fraction form
    1,285.17/1,928.28 = 669.31/x
  3. Step 3: Cross multiply
    1,285.17x = 1,928.28 × 669.31
  4. Step 4: Simplify right side
    1,285.17x = 1,290,623.74
  5. Step 5: Solve for x
    x = 1,290,623.74/1,285.17
  6. Step 6: Final answer
    x = 1,004.25

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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.