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Finding the Fourth Proportional to 420.90, 630.50 and 247.07

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Solution

The fourth proportional to 420.90, 630.50 and 247.07 is: 370.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.90 : 630.50 = 247.07 : x
  2. Step 2: Convert to fraction form
    420.90/630.50 = 247.07/x
  3. Step 3: Cross multiply
    420.90x = 630.50 × 247.07
  4. Step 4: Simplify right side
    420.90x = 155,773.25
  5. Step 5: Solve for x
    x = 155,773.25/420.90
  6. Step 6: Final answer
    x = 370.10

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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.