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Finding the Fourth Proportional to 420.08, 631.20 and 317.48

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Solution

The fourth proportional to 420.08, 631.20 and 317.48 is: 477.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.08 : 631.20 = 317.48 : x
  2. Step 2: Convert to fraction form
    420.08/631.20 = 317.48/x
  3. Step 3: Cross multiply
    420.08x = 631.20 × 317.48
  4. Step 4: Simplify right side
    420.08x = 200,393.38
  5. Step 5: Solve for x
    x = 200,393.38/420.08
  6. Step 6: Final answer
    x = 477.04

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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.