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Finding the Fourth Proportional to 420.18, 631.18 and 283.49

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Solution

The fourth proportional to 420.18, 631.18 and 283.49 is: 425.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.18 : 631.18 = 283.49 : x
  2. Step 2: Convert to fraction form
    420.18/631.18 = 283.49/x
  3. Step 3: Cross multiply
    420.18x = 631.18 × 283.49
  4. Step 4: Simplify right side
    420.18x = 178,933.22
  5. Step 5: Solve for x
    x = 178,933.22/420.18
  6. Step 6: Final answer
    x = 425.85

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Double scale
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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.