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Finding the Fourth Proportional to 948.42, 1,423.26 and 428.76

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Solution

The fourth proportional to 948.42, 1,423.26 and 428.76 is: 643.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.42 : 1,423.26 = 428.76 : x
  2. Step 2: Convert to fraction form
    948.42/1,423.26 = 428.76/x
  3. Step 3: Cross multiply
    948.42x = 1,423.26 × 428.76
  4. Step 4: Simplify right side
    948.42x = 610,236.96
  5. Step 5: Solve for x
    x = 610,236.96/948.42
  6. Step 6: Final answer
    x = 643.42

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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.