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Finding the Fourth Proportional to 21,008.90, 28,991.13 and 13,050.98

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Solution

The fourth proportional to 21,008.90, 28,991.13 and 13,050.98 is: 18,009.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.90 : 28,991.13 = 13,050.98 : x
  2. Step 2: Convert to fraction form
    21,008.90/28,991.13 = 13,050.98/x
  3. Step 3: Cross multiply
    21,008.90x = 28,991.13 × 13,050.98
  4. Step 4: Simplify right side
    21,008.90x = 378,362,512.85
  5. Step 5: Solve for x
    x = 378,362,512.85/21,008.90
  6. Step 6: Final answer
    x = 18,009.63

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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.