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Finding the Fourth Proportional to 426.07, 640.53 and 349.60

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Solution

The fourth proportional to 426.07, 640.53 and 349.60 is: 525.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.07 : 640.53 = 349.60 : x
  2. Step 2: Convert to fraction form
    426.07/640.53 = 349.60/x
  3. Step 3: Cross multiply
    426.07x = 640.53 × 349.60
  4. Step 4: Simplify right side
    426.07x = 223,929.29
  5. Step 5: Solve for x
    x = 223,929.29/426.07
  6. Step 6: Final answer
    x = 525.57

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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.