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Finding the Fourth Proportional to 1,687.41, 2,328.83 and 988.78

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Solution

The fourth proportional to 1,687.41, 2,328.83 and 988.78 is: 1,364.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.41 : 2,328.83 = 988.78 : x
  2. Step 2: Convert to fraction form
    1,687.41/2,328.83 = 988.78/x
  3. Step 3: Cross multiply
    1,687.41x = 2,328.83 × 988.78
  4. Step 4: Simplify right side
    1,687.41x = 2,302,695.58
  5. Step 5: Solve for x
    x = 2,302,695.58/1,687.41
  6. Step 6: Final answer
    x = 1,364.64

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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.