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Finding the Fourth Proportional to 28,420.92, 42,631.35 and 7,644.42

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Solution

The fourth proportional to 28,420.92, 42,631.35 and 7,644.42 is: 11,466.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.92 : 42,631.35 = 7,644.42 : x
  2. Step 2: Convert to fraction form
    28,420.92/42,631.35 = 7,644.42/x
  3. Step 3: Cross multiply
    28,420.92x = 42,631.35 × 7,644.42
  4. Step 4: Simplify right side
    28,420.92x = 325,891,944.57
  5. Step 5: Solve for x
    x = 325,891,944.57/28,420.92
  6. Step 6: Final answer
    x = 11,466.62

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1.5x scale

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.