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Finding the Fourth Proportional to 1,139.19, 1,571.90 and 719.77

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Solution

The fourth proportional to 1,139.19, 1,571.90 and 719.77 is: 993.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.19 : 1,571.90 = 719.77 : x
  2. Step 2: Convert to fraction form
    1,139.19/1,571.90 = 719.77/x
  3. Step 3: Cross multiply
    1,139.19x = 1,571.90 × 719.77
  4. Step 4: Simplify right side
    1,139.19x = 1,131,406.46
  5. Step 5: Solve for x
    x = 1,131,406.46/1,139.19
  6. Step 6: Final answer
    x = 993.17

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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.