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Finding the Fourth Proportional to 420.73, 630.61 and 215.01

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Solution

The fourth proportional to 420.73, 630.61 and 215.01 is: 322.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.73 : 630.61 = 215.01 : x
  2. Step 2: Convert to fraction form
    420.73/630.61 = 215.01/x
  3. Step 3: Cross multiply
    420.73x = 630.61 × 215.01
  4. Step 4: Simplify right side
    420.73x = 135,587.46
  5. Step 5: Solve for x
    x = 135,587.46/420.73
  6. Step 6: Final answer
    x = 322.27

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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.