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Finding the Fourth Proportional to 1,438.66, 2,160.15 and 823.06

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Solution

The fourth proportional to 1,438.66, 2,160.15 and 823.06 is: 1,235.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.66 : 2,160.15 = 823.06 : x
  2. Step 2: Convert to fraction form
    1,438.66/2,160.15 = 823.06/x
  3. Step 3: Cross multiply
    1,438.66x = 2,160.15 × 823.06
  4. Step 4: Simplify right side
    1,438.66x = 1,777,933.06
  5. Step 5: Solve for x
    x = 1,777,933.06/1,438.66
  6. Step 6: Final answer
    x = 1,235.83

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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.