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Finding the Fourth Proportional to 1,220.64, 1,689.12 and 1,065.84

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Solution

The fourth proportional to 1,220.64, 1,689.12 and 1,065.84 is: 1,474.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.64 : 1,689.12 = 1,065.84 : x
  2. Step 2: Convert to fraction form
    1,220.64/1,689.12 = 1,065.84/x
  3. Step 3: Cross multiply
    1,220.64x = 1,689.12 × 1,065.84
  4. Step 4: Simplify right side
    1,220.64x = 1,800,331.66
  5. Step 5: Solve for x
    x = 1,800,331.66/1,220.64
  6. Step 6: Final answer
    x = 1,474.91

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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.