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Finding the Fourth Proportional to 557.36, 835.32 and 421.28

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Solution

The fourth proportional to 557.36, 835.32 and 421.28 is: 631.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.36 : 835.32 = 421.28 : x
  2. Step 2: Convert to fraction form
    557.36/835.32 = 421.28/x
  3. Step 3: Cross multiply
    557.36x = 835.32 × 421.28
  4. Step 4: Simplify right side
    557.36x = 351,903.61
  5. Step 5: Solve for x
    x = 351,903.61/557.36
  6. Step 6: Final answer
    x = 631.38

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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.