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Finding the Fourth Proportional to 21,979.70, 30,332.08 and 11,908.16

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Solution

The fourth proportional to 21,979.70, 30,332.08 and 11,908.16 is: 16,433.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.70 : 30,332.08 = 11,908.16 : x
  2. Step 2: Convert to fraction form
    21,979.70/30,332.08 = 11,908.16/x
  3. Step 3: Cross multiply
    21,979.70x = 30,332.08 × 11,908.16
  4. Step 4: Simplify right side
    21,979.70x = 361,199,261.77
  5. Step 5: Solve for x
    x = 361,199,261.77/21,979.70
  6. Step 6: Final answer
    x = 16,433.31

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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.