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Finding the Fourth Proportional to 21,307.80, 31,961.70 and 10,939.80

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Solution

The fourth proportional to 21,307.80, 31,961.70 and 10,939.80 is: 16,409.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.80 : 31,961.70 = 10,939.80 : x
  2. Step 2: Convert to fraction form
    21,307.80/31,961.70 = 10,939.80/x
  3. Step 3: Cross multiply
    21,307.80x = 31,961.70 × 10,939.80
  4. Step 4: Simplify right side
    21,307.80x = 349,654,605.66
  5. Step 5: Solve for x
    x = 349,654,605.66/21,307.80
  6. Step 6: Final answer
    x = 16,409.70

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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.