Home / 1,418.67-2,127.80-688.05

Finding the Fourth Proportional to 1,418.67, 2,127.80 and 688.05

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Solution

The fourth proportional to 1,418.67, 2,127.80 and 688.05 is: 1,031.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.67 : 2,127.80 = 688.05 : x
  2. Step 2: Convert to fraction form
    1,418.67/2,127.80 = 688.05/x
  3. Step 3: Cross multiply
    1,418.67x = 2,127.80 × 688.05
  4. Step 4: Simplify right side
    1,418.67x = 1,464,034.51
  5. Step 5: Solve for x
    x = 1,464,034.51/1,418.67
  6. Step 6: Final answer
    x = 1,031.98

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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.