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Finding the Fourth Proportional to 459.61, 690.10 and 440.17

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Solution

The fourth proportional to 459.61, 690.10 and 440.17 is: 660.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.61 : 690.10 = 440.17 : x
  2. Step 2: Convert to fraction form
    459.61/690.10 = 440.17/x
  3. Step 3: Cross multiply
    459.61x = 690.10 × 440.17
  4. Step 4: Simplify right side
    459.61x = 303,760.97
  5. Step 5: Solve for x
    x = 303,760.97/459.61
  6. Step 6: Final answer
    x = 660.91

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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.