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Finding the Fourth Proportional to 1,285.02, 1,921.86 and 763.74

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Solution

The fourth proportional to 1,285.02, 1,921.86 and 763.74 is: 1,142.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.02 : 1,921.86 = 763.74 : x
  2. Step 2: Convert to fraction form
    1,285.02/1,921.86 = 763.74/x
  3. Step 3: Cross multiply
    1,285.02x = 1,921.86 × 763.74
  4. Step 4: Simplify right side
    1,285.02x = 1,467,801.36
  5. Step 5: Solve for x
    x = 1,467,801.36/1,285.02
  6. Step 6: Final answer
    x = 1,142.24

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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.