Home / 1,222.15-1,686.46-691.00

Finding the Fourth Proportional to 1,222.15, 1,686.46 and 691.00

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Solution

The fourth proportional to 1,222.15, 1,686.46 and 691.00 is: 953.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.15 : 1,686.46 = 691.00 : x
  2. Step 2: Convert to fraction form
    1,222.15/1,686.46 = 691.00/x
  3. Step 3: Cross multiply
    1,222.15x = 1,686.46 × 691.00
  4. Step 4: Simplify right side
    1,222.15x = 1,165,344.24
  5. Step 5: Solve for x
    x = 1,165,344.24/1,222.15
  6. Step 6: Final answer
    x = 953.52

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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.