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Finding the Fourth Proportional to 21,999.98, 30,357.70 and 13,047.86

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Solution

The fourth proportional to 21,999.98, 30,357.70 and 13,047.86 is: 18,004.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.98 : 30,357.70 = 13,047.86 : x
  2. Step 2: Convert to fraction form
    21,999.98/30,357.70 = 13,047.86/x
  3. Step 3: Cross multiply
    21,999.98x = 30,357.70 × 13,047.86
  4. Step 4: Simplify right side
    21,999.98x = 396,102,835.11
  5. Step 5: Solve for x
    x = 396,102,835.11/21,999.98
  6. Step 6: Final answer
    x = 18,004.69

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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.