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Finding the Fourth Proportional to 21,390.80, 32,086.20 and 19,276.70

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Solution

The fourth proportional to 21,390.80, 32,086.20 and 19,276.70 is: 28,915.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.80 : 32,086.20 = 19,276.70 : x
  2. Step 2: Convert to fraction form
    21,390.80/32,086.20 = 19,276.70/x
  3. Step 3: Cross multiply
    21,390.80x = 32,086.20 × 19,276.70
  4. Step 4: Simplify right side
    21,390.80x = 618,516,051.54
  5. Step 5: Solve for x
    x = 618,516,051.54/21,390.80
  6. Step 6: Final answer
    x = 28,915.05

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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.