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Finding the Fourth Proportional to 21,702.40, 32,553.60 and 20,390.20

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Solution

The fourth proportional to 21,702.40, 32,553.60 and 20,390.20 is: 30,585.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,702.40 : 32,553.60 = 20,390.20 : x
  2. Step 2: Convert to fraction form
    21,702.40/32,553.60 = 20,390.20/x
  3. Step 3: Cross multiply
    21,702.40x = 32,553.60 × 20,390.20
  4. Step 4: Simplify right side
    21,702.40x = 663,774,414.72
  5. Step 5: Solve for x
    x = 663,774,414.72/21,702.40
  6. Step 6: Final answer
    x = 30,585.30

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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.