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Finding the Fourth Proportional to 21,009.94, 28,993.34 and 11,449.91

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Solution

The fourth proportional to 21,009.94, 28,993.34 and 11,449.91 is: 15,800.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.94 : 28,993.34 = 11,449.91 : x
  2. Step 2: Convert to fraction form
    21,009.94/28,993.34 = 11,449.91/x
  3. Step 3: Cross multiply
    21,009.94x = 28,993.34 × 11,449.91
  4. Step 4: Simplify right side
    21,009.94x = 331,970,931.38
  5. Step 5: Solve for x
    x = 331,970,931.38/21,009.94
  6. Step 6: Final answer
    x = 15,800.66

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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.