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Finding the Fourth Proportional to 1,687.48, 2,329.62 and 988.84

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Solution

The fourth proportional to 1,687.48, 2,329.62 and 988.84 is: 1,365.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.48 : 2,329.62 = 988.84 : x
  2. Step 2: Convert to fraction form
    1,687.48/2,329.62 = 988.84/x
  3. Step 3: Cross multiply
    1,687.48x = 2,329.62 × 988.84
  4. Step 4: Simplify right side
    1,687.48x = 2,303,621.44
  5. Step 5: Solve for x
    x = 2,303,621.44/1,687.48
  6. Step 6: Final answer
    x = 1,365.13

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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.