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Finding the Fourth Proportional to 21,649.98, 29,897.60 and 20,470.59

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Solution

The fourth proportional to 21,649.98, 29,897.60 and 20,470.59 is: 28,268.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,649.98 : 29,897.60 = 20,470.59 : x
  2. Step 2: Convert to fraction form
    21,649.98/29,897.60 = 20,470.59/x
  3. Step 3: Cross multiply
    21,649.98x = 29,897.60 × 20,470.59
  4. Step 4: Simplify right side
    21,649.98x = 612,021,409.23
  5. Step 5: Solve for x
    x = 612,021,409.23/21,649.98
  6. Step 6: Final answer
    x = 28,268.91

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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.