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Finding the Fourth Proportional to 561.12, 836.20 and 555.65

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Solution

The fourth proportional to 561.12, 836.20 and 555.65 is: 828.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.12 : 836.20 = 555.65 : x
  2. Step 2: Convert to fraction form
    561.12/836.20 = 555.65/x
  3. Step 3: Cross multiply
    561.12x = 836.20 × 555.65
  4. Step 4: Simplify right side
    561.12x = 464,634.53
  5. Step 5: Solve for x
    x = 464,634.53/561.12
  6. Step 6: Final answer
    x = 828.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.