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Finding the Fourth Proportional to 420.74, 630.88 and 173.88

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Solution

The fourth proportional to 420.74, 630.88 and 173.88 is: 260.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.74 : 630.88 = 173.88 : x
  2. Step 2: Convert to fraction form
    420.74/630.88 = 173.88/x
  3. Step 3: Cross multiply
    420.74x = 630.88 × 173.88
  4. Step 4: Simplify right side
    420.74x = 109,696.55
  5. Step 5: Solve for x
    x = 109,696.55/420.74
  6. Step 6: Final answer
    x = 260.72

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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.