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Finding the Fourth Proportional to 420.34, 630.51 and 204.10

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Solution

The fourth proportional to 420.34, 630.51 and 204.10 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.34 : 630.51 = 204.10 : x
  2. Step 2: Convert to fraction form
    420.34/630.51 = 204.10/x
  3. Step 3: Cross multiply
    420.34x = 630.51 × 204.10
  4. Step 4: Simplify right side
    420.34x = 128,687.09
  5. Step 5: Solve for x
    x = 128,687.09/420.34
  6. Step 6: Final answer
    x = 306.15

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Double scale
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Similar ratio
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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.