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Finding the Fourth Proportional to 557.38, 836.48 and 420.59

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Solution

The fourth proportional to 557.38, 836.48 and 420.59 is: 631.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.38 : 836.48 = 420.59 : x
  2. Step 2: Convert to fraction form
    557.38/836.48 = 420.59/x
  3. Step 3: Cross multiply
    557.38x = 836.48 × 420.59
  4. Step 4: Simplify right side
    557.38x = 351,815.12
  5. Step 5: Solve for x
    x = 351,815.12/557.38
  6. Step 6: Final answer
    x = 631.19

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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.