Home / 1,418.50-2,127.96-688.12

Finding the Fourth Proportional to 1,418.50, 2,127.96 and 688.12

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Solution

The fourth proportional to 1,418.50, 2,127.96 and 688.12 is: 1,032.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.50 : 2,127.96 = 688.12 : x
  2. Step 2: Convert to fraction form
    1,418.50/2,127.96 = 688.12/x
  3. Step 3: Cross multiply
    1,418.50x = 2,127.96 × 688.12
  4. Step 4: Simplify right side
    1,418.50x = 1,464,291.84
  5. Step 5: Solve for x
    x = 1,464,291.84/1,418.50
  6. Step 6: Final answer
    x = 1,032.28

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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.