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Finding the Fourth Proportional to 1,770, 2,440.96 and 1,139.76

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Solution

The fourth proportional to 1,770, 2,440.96 and 1,139.76 is: 1,571.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,770 : 2,440.96 = 1,139.76 : x
  2. Step 2: Convert to fraction form
    1,770/2,440.96 = 1,139.76/x
  3. Step 3: Cross multiply
    1,770x = 2,440.96 × 1,139.76
  4. Step 4: Simplify right side
    1,770x = 2,782,108.57
  5. Step 5: Solve for x
    x = 2,782,108.57/1,770
  6. Step 6: Final answer
    x = 1,571.81

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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.