Home / 1,215.26-1,677.10-691.28

Finding the Fourth Proportional to 1,215.26, 1,677.10 and 691.28

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Solution

The fourth proportional to 1,215.26, 1,677.10 and 691.28 is: 953.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.26 : 1,677.10 = 691.28 : x
  2. Step 2: Convert to fraction form
    1,215.26/1,677.10 = 691.28/x
  3. Step 3: Cross multiply
    1,215.26x = 1,677.10 × 691.28
  4. Step 4: Simplify right side
    1,215.26x = 1,159,345.69
  5. Step 5: Solve for x
    x = 1,159,345.69/1,215.26
  6. Step 6: Final answer
    x = 953.99

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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.