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Finding the Fourth Proportional to 557.76, 835.86 and 420.63

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Solution

The fourth proportional to 557.76, 835.86 and 420.63 is: 630.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.76 : 835.86 = 420.63 : x
  2. Step 2: Convert to fraction form
    557.76/835.86 = 420.63/x
  3. Step 3: Cross multiply
    557.76x = 835.86 × 420.63
  4. Step 4: Simplify right side
    557.76x = 351,587.79
  5. Step 5: Solve for x
    x = 351,587.79/557.76
  6. Step 6: Final answer
    x = 630.36

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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.