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Finding the Fourth Proportional to 31,809.13, 47,713.69 and 9,921.13

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Solution

The fourth proportional to 31,809.13, 47,713.69 and 9,921.13 is: 14,881.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,809.13 : 47,713.69 = 9,921.13 : x
  2. Step 2: Convert to fraction form
    31,809.13/47,713.69 = 9,921.13/x
  3. Step 3: Cross multiply
    31,809.13x = 47,713.69 × 9,921.13
  4. Step 4: Simplify right side
    31,809.13x = 473,373,721.27
  5. Step 5: Solve for x
    x = 473,373,721.27/31,809.13
  6. Step 6: Final answer
    x = 14,881.69

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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.