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Finding the Fourth Proportional to 1,335.32, 2,003 and 685.66

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Solution

The fourth proportional to 1,335.32, 2,003 and 685.66 is: 1,028.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.32 : 2,003 = 685.66 : x
  2. Step 2: Convert to fraction form
    1,335.32/2,003 = 685.66/x
  3. Step 3: Cross multiply
    1,335.32x = 2,003 × 685.66
  4. Step 4: Simplify right side
    1,335.32x = 1,373,376.98
  5. Step 5: Solve for x
    x = 1,373,376.98/1,335.32
  6. Step 6: Final answer
    x = 1,028.50

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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.