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Finding the Fourth Proportional to 1,285.76, 1,928.16 and 495.02

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Solution

The fourth proportional to 1,285.76, 1,928.16 and 495.02 is: 742.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.76 : 1,928.16 = 495.02 : x
  2. Step 2: Convert to fraction form
    1,285.76/1,928.16 = 495.02/x
  3. Step 3: Cross multiply
    1,285.76x = 1,928.16 × 495.02
  4. Step 4: Simplify right side
    1,285.76x = 954,468.12
  5. Step 5: Solve for x
    x = 954,468.12/1,285.76
  6. Step 6: Final answer
    x = 742.34

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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.