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Finding the Fourth Proportional to 1,191.45, 1,644.21 and 719.37

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Solution

The fourth proportional to 1,191.45, 1,644.21 and 719.37 is: 992.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.45 : 1,644.21 = 719.37 : x
  2. Step 2: Convert to fraction form
    1,191.45/1,644.21 = 719.37/x
  3. Step 3: Cross multiply
    1,191.45x = 1,644.21 × 719.37
  4. Step 4: Simplify right side
    1,191.45x = 1,182,795.35
  5. Step 5: Solve for x
    x = 1,182,795.35/1,191.45
  6. Step 6: Final answer
    x = 992.74

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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.