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Finding the Fourth Proportional to 1,438.32, 1,984.83 and 808.87

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Solution

The fourth proportional to 1,438.32, 1,984.83 and 808.87 is: 1,116.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.32 : 1,984.83 = 808.87 : x
  2. Step 2: Convert to fraction form
    1,438.32/1,984.83 = 808.87/x
  3. Step 3: Cross multiply
    1,438.32x = 1,984.83 × 808.87
  4. Step 4: Simplify right side
    1,438.32x = 1,605,469.44
  5. Step 5: Solve for x
    x = 1,605,469.44/1,438.32
  6. Step 6: Final answer
    x = 1,116.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.