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Finding the Fourth Proportional to 1,139.06, 1,571.54 and 719.85

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Solution

The fourth proportional to 1,139.06, 1,571.54 and 719.85 is: 993.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.06 : 1,571.54 = 719.85 : x
  2. Step 2: Convert to fraction form
    1,139.06/1,571.54 = 719.85/x
  3. Step 3: Cross multiply
    1,139.06x = 1,571.54 × 719.85
  4. Step 4: Simplify right side
    1,139.06x = 1,131,275.36
  5. Step 5: Solve for x
    x = 1,131,275.36/1,139.06
  6. Step 6: Final answer
    x = 993.16

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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.