Home / 1,421.65-1,961.18-1,224.82

Finding the Fourth Proportional to 1,421.65, 1,961.18 and 1,224.82

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Solution

The fourth proportional to 1,421.65, 1,961.18 and 1,224.82 is: 1,689.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.65 : 1,961.18 = 1,224.82 : x
  2. Step 2: Convert to fraction form
    1,421.65/1,961.18 = 1,224.82/x
  3. Step 3: Cross multiply
    1,421.65x = 1,961.18 × 1,224.82
  4. Step 4: Simplify right side
    1,421.65x = 2,402,076.56
  5. Step 5: Solve for x
    x = 2,402,076.56/1,421.65
  6. Step 6: Final answer
    x = 1,689.65

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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.