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Finding the Fourth Proportional to 613.28, 918.40 and 459.04

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Solution

The fourth proportional to 613.28, 918.40 and 459.04 is: 687.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.28 : 918.40 = 459.04 : x
  2. Step 2: Convert to fraction form
    613.28/918.40 = 459.04/x
  3. Step 3: Cross multiply
    613.28x = 918.40 × 459.04
  4. Step 4: Simplify right side
    613.28x = 421,582.34
  5. Step 5: Solve for x
    x = 421,582.34/613.28
  6. Step 6: Final answer
    x = 687.42

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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.