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Finding the Fourth Proportional to 21,770.91, 32,669.42 and 7,920.99

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Solution

The fourth proportional to 21,770.91, 32,669.42 and 7,920.99 is: 11,886.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,770.91 : 32,669.42 = 7,920.99 : x
  2. Step 2: Convert to fraction form
    21,770.91/32,669.42 = 7,920.99/x
  3. Step 3: Cross multiply
    21,770.91x = 32,669.42 × 7,920.99
  4. Step 4: Simplify right side
    21,770.91x = 258,774,109.52
  5. Step 5: Solve for x
    x = 258,774,109.52/21,770.91
  6. Step 6: Final answer
    x = 11,886.23

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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.