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Finding the Fourth Proportional to 21,781.90, 32,667.18 and 6,983.20

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Solution

The fourth proportional to 21,781.90, 32,667.18 and 6,983.20 is: 10,472.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,781.90 : 32,667.18 = 6,983.20 : x
  2. Step 2: Convert to fraction form
    21,781.90/32,667.18 = 6,983.20/x
  3. Step 3: Cross multiply
    21,781.90x = 32,667.18 × 6,983.20
  4. Step 4: Simplify right side
    21,781.90x = 228,121,451.38
  5. Step 5: Solve for x
    x = 228,121,451.38/21,781.90
  6. Step 6: Final answer
    x = 10,472.98

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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.