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Finding the Fourth Proportional to 1,687, 2,328.12 and 988.42

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Solution

The fourth proportional to 1,687, 2,328.12 and 988.42 is: 1,364.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687 : 2,328.12 = 988.42 : x
  2. Step 2: Convert to fraction form
    1,687/2,328.12 = 988.42/x
  3. Step 3: Cross multiply
    1,687x = 2,328.12 × 988.42
  4. Step 4: Simplify right side
    1,687x = 2,301,160.37
  5. Step 5: Solve for x
    x = 2,301,160.37/1,687
  6. Step 6: Final answer
    x = 1,364.05

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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.