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Finding the Fourth Proportional to 21,691.86, 32,563.65 and 12,930.90

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Solution

The fourth proportional to 21,691.86, 32,563.65 and 12,930.90 is: 19,411.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.86 : 32,563.65 = 12,930.90 : x
  2. Step 2: Convert to fraction form
    21,691.86/32,563.65 = 12,930.90/x
  3. Step 3: Cross multiply
    21,691.86x = 32,563.65 × 12,930.90
  4. Step 4: Simplify right side
    21,691.86x = 421,077,301.79
  5. Step 5: Solve for x
    x = 421,077,301.79/21,691.86
  6. Step 6: Final answer
    x = 19,411.77

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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.