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Finding the Fourth Proportional to 30,672.52, 42,360.21 and 21,137.20

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Solution

The fourth proportional to 30,672.52, 42,360.21 and 21,137.20 is: 29,191.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,672.52 : 42,360.21 = 21,137.20 : x
  2. Step 2: Convert to fraction form
    30,672.52/42,360.21 = 21,137.20/x
  3. Step 3: Cross multiply
    30,672.52x = 42,360.21 × 21,137.20
  4. Step 4: Simplify right side
    30,672.52x = 895,376,124.91
  5. Step 5: Solve for x
    x = 895,376,124.91/30,672.52
  6. Step 6: Final answer
    x = 29,191.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.