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Finding the Fourth Proportional to 561.28, 840.64 and 344.48

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Solution

The fourth proportional to 561.28, 840.64 and 344.48 is: 515.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.28 : 840.64 = 344.48 : x
  2. Step 2: Convert to fraction form
    561.28/840.64 = 344.48/x
  3. Step 3: Cross multiply
    561.28x = 840.64 × 344.48
  4. Step 4: Simplify right side
    561.28x = 289,583.67
  5. Step 5: Solve for x
    x = 289,583.67/561.28
  6. Step 6: Final answer
    x = 515.93

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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.