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Finding the Fourth Proportional to 21,428.76, 32,142.84 and 20,899.32

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Solution

The fourth proportional to 21,428.76, 32,142.84 and 20,899.32 is: 31,348.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,428.76 : 32,142.84 = 20,899.32 : x
  2. Step 2: Convert to fraction form
    21,428.76/32,142.84 = 20,899.32/x
  3. Step 3: Cross multiply
    21,428.76x = 32,142.84 × 20,899.32
  4. Step 4: Simplify right side
    21,428.76x = 671,763,498.87
  5. Step 5: Solve for x
    x = 671,763,498.87/21,428.76
  6. Step 6: Final answer
    x = 31,348.69

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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.