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Finding the Fourth Proportional to 420.35, 630.35 and 173.39

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Solution

The fourth proportional to 420.35, 630.35 and 173.39 is: 260.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.35 : 630.35 = 173.39 : x
  2. Step 2: Convert to fraction form
    420.35/630.35 = 173.39/x
  3. Step 3: Cross multiply
    420.35x = 630.35 × 173.39
  4. Step 4: Simplify right side
    420.35x = 109,296.39
  5. Step 5: Solve for x
    x = 109,296.39/420.35
  6. Step 6: Final answer
    x = 260.01

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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.