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Finding the Fourth Proportional to 1,817, 2,507.52 and 989

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Solution

The fourth proportional to 1,817, 2,507.52 and 989 is: 1,364.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,817 : 2,507.52 = 989 : x
  2. Step 2: Convert to fraction form
    1,817/2,507.52 = 989/x
  3. Step 3: Cross multiply
    1,817x = 2,507.52 × 989
  4. Step 4: Simplify right side
    1,817x = 2,479,937.28
  5. Step 5: Solve for x
    x = 2,479,937.28/1,817
  6. Step 6: Final answer
    x = 1,364.85

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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.