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Finding the Fourth Proportional to 21,920.91, 30,254.64 and 21,191.91

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Solution

The fourth proportional to 21,920.91, 30,254.64 and 21,191.91 is: 29,248.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.91 : 30,254.64 = 21,191.91 : x
  2. Step 2: Convert to fraction form
    21,920.91/30,254.64 = 21,191.91/x
  3. Step 3: Cross multiply
    21,920.91x = 30,254.64 × 21,191.91
  4. Step 4: Simplify right side
    21,920.91x = 641,153,607.96
  5. Step 5: Solve for x
    x = 641,153,607.96/21,920.91
  6. Step 6: Final answer
    x = 29,248.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.