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Finding the Fourth Proportional to 561.52, 839.88 and 415.36

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Solution

The fourth proportional to 561.52, 839.88 and 415.36 is: 621.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.52 : 839.88 = 415.36 : x
  2. Step 2: Convert to fraction form
    561.52/839.88 = 415.36/x
  3. Step 3: Cross multiply
    561.52x = 839.88 × 415.36
  4. Step 4: Simplify right side
    561.52x = 348,852.56
  5. Step 5: Solve for x
    x = 348,852.56/561.52
  6. Step 6: Final answer
    x = 621.26

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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.