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Finding the Fourth Proportional to 556.62, 836.98 and 420.24

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Solution

The fourth proportional to 556.62, 836.98 and 420.24 is: 631.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.62 : 836.98 = 420.24 : x
  2. Step 2: Convert to fraction form
    556.62/836.98 = 420.24/x
  3. Step 3: Cross multiply
    556.62x = 836.98 × 420.24
  4. Step 4: Simplify right side
    556.62x = 351,732.22
  5. Step 5: Solve for x
    x = 351,732.22/556.62
  6. Step 6: Final answer
    x = 631.91

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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.