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Finding the Fourth Proportional to 558.61, 836.36 and 421.24

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Solution

The fourth proportional to 558.61, 836.36 and 421.24 is: 630.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.61 : 836.36 = 421.24 : x
  2. Step 2: Convert to fraction form
    558.61/836.36 = 421.24/x
  3. Step 3: Cross multiply
    558.61x = 836.36 × 421.24
  4. Step 4: Simplify right side
    558.61x = 352,308.29
  5. Step 5: Solve for x
    x = 352,308.29/558.61
  6. Step 6: Final answer
    x = 630.69

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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.