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Finding the Fourth Proportional to 719.91, 1,078.70 and 459.45

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Solution

The fourth proportional to 719.91, 1,078.70 and 459.45 is: 688.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.91 : 1,078.70 = 459.45 : x
  2. Step 2: Convert to fraction form
    719.91/1,078.70 = 459.45/x
  3. Step 3: Cross multiply
    719.91x = 1,078.70 × 459.45
  4. Step 4: Simplify right side
    719.91x = 495,606.42
  5. Step 5: Solve for x
    x = 495,606.42/719.91
  6. Step 6: Final answer
    x = 688.43

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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.