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Finding the Fourth Proportional to 719.32, 1,078.91 and 445.45

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Solution

The fourth proportional to 719.32, 1,078.91 and 445.45 is: 668.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.32 : 1,078.91 = 445.45 : x
  2. Step 2: Convert to fraction form
    719.32/1,078.91 = 445.45/x
  3. Step 3: Cross multiply
    719.32x = 1,078.91 × 445.45
  4. Step 4: Simplify right side
    719.32x = 480,592.84
  5. Step 5: Solve for x
    x = 480,592.84/719.32
  6. Step 6: Final answer
    x = 668.13

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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.