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Finding the Fourth Proportional to 1,487.32, 2,231.00 and 391.64

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Solution

The fourth proportional to 1,487.32, 2,231.00 and 391.64 is: 587.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.32 : 2,231.00 = 391.64 : x
  2. Step 2: Convert to fraction form
    1,487.32/2,231.00 = 391.64/x
  3. Step 3: Cross multiply
    1,487.32x = 2,231.00 × 391.64
  4. Step 4: Simplify right side
    1,487.32x = 873,742.28
  5. Step 5: Solve for x
    x = 873,742.28/1,487.32
  6. Step 6: Final answer
    x = 587.46

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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.