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Finding the Fourth Proportional to 18,938.17, 28,407.21 and 5,612.21

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Solution

The fourth proportional to 18,938.17, 28,407.21 and 5,612.21 is: 8,418.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938.17 : 28,407.21 = 5,612.21 : x
  2. Step 2: Convert to fraction form
    18,938.17/28,407.21 = 5,612.21/x
  3. Step 3: Cross multiply
    18,938.17x = 28,407.21 × 5,612.21
  4. Step 4: Simplify right side
    18,938.17x = 159,427,228.03
  5. Step 5: Solve for x
    x = 159,427,228.03/18,938.17
  6. Step 6: Final answer
    x = 8,418.30

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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.