Home / 1,220.70-1,688.94-1,065.72

Finding the Fourth Proportional to 1,220.70, 1,688.94 and 1,065.72

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Solution

The fourth proportional to 1,220.70, 1,688.94 and 1,065.72 is: 1,474.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.70 : 1,688.94 = 1,065.72 : x
  2. Step 2: Convert to fraction form
    1,220.70/1,688.94 = 1,065.72/x
  3. Step 3: Cross multiply
    1,220.70x = 1,688.94 × 1,065.72
  4. Step 4: Simplify right side
    1,220.70x = 1,799,937.14
  5. Step 5: Solve for x
    x = 1,799,937.14/1,220.70
  6. Step 6: Final answer
    x = 1,474.51

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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.