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Finding the Fourth Proportional to 558.69, 838.37 and 421.53

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Solution

The fourth proportional to 558.69, 838.37 and 421.53 is: 632.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.69 : 838.37 = 421.53 : x
  2. Step 2: Convert to fraction form
    558.69/838.37 = 421.53/x
  3. Step 3: Cross multiply
    558.69x = 838.37 × 421.53
  4. Step 4: Simplify right side
    558.69x = 353,398.11
  5. Step 5: Solve for x
    x = 353,398.11/558.69
  6. Step 6: Final answer
    x = 632.55

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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.