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Finding the Fourth Proportional to 719.21, 1,079.01 and 372.80

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Solution

The fourth proportional to 719.21, 1,079.01 and 372.80 is: 559.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.21 : 1,079.01 = 372.80 : x
  2. Step 2: Convert to fraction form
    719.21/1,079.01 = 372.80/x
  3. Step 3: Cross multiply
    719.21x = 1,079.01 × 372.80
  4. Step 4: Simplify right side
    719.21x = 402,254.93
  5. Step 5: Solve for x
    x = 402,254.93/719.21
  6. Step 6: Final answer
    x = 559.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.