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Finding the Fourth Proportional to 1,224.09, 1,686.96 and 874.17

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Solution

The fourth proportional to 1,224.09, 1,686.96 and 874.17 is: 1,204.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.09 : 1,686.96 = 874.17 : x
  2. Step 2: Convert to fraction form
    1,224.09/1,686.96 = 874.17/x
  3. Step 3: Cross multiply
    1,224.09x = 1,686.96 × 874.17
  4. Step 4: Simplify right side
    1,224.09x = 1,474,689.82
  5. Step 5: Solve for x
    x = 1,474,689.82/1,224.09
  6. Step 6: Final answer
    x = 1,204.72

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1.5x scale

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.