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Finding the Fourth Proportional to 613.01, 918.81 and 440.10

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Solution

The fourth proportional to 613.01, 918.81 and 440.10 is: 659.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.01 : 918.81 = 440.10 : x
  2. Step 2: Convert to fraction form
    613.01/918.81 = 440.10/x
  3. Step 3: Cross multiply
    613.01x = 918.81 × 440.10
  4. Step 4: Simplify right side
    613.01x = 404,368.28
  5. Step 5: Solve for x
    x = 404,368.28/613.01
  6. Step 6: Final answer
    x = 659.64

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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.