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Finding the Fourth Proportional to 21,959.86, 30,294.12 and 21,111.16

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Solution

The fourth proportional to 21,959.86, 30,294.12 and 21,111.16 is: 29,123.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.86 : 30,294.12 = 21,111.16 : x
  2. Step 2: Convert to fraction form
    21,959.86/30,294.12 = 21,111.16/x
  3. Step 3: Cross multiply
    21,959.86x = 30,294.12 × 21,111.16
  4. Step 4: Simplify right side
    21,959.86x = 639,544,014.38
  5. Step 5: Solve for x
    x = 639,544,014.38/21,959.86
  6. Step 6: Final answer
    x = 29,123.32

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Double scale
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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.