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Finding the Fourth Proportional to 21,009.83, 28,984.38 and 15,039.32

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Solution

The fourth proportional to 21,009.83, 28,984.38 and 15,039.32 is: 20,747.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.83 : 28,984.38 = 15,039.32 : x
  2. Step 2: Convert to fraction form
    21,009.83/28,984.38 = 15,039.32/x
  3. Step 3: Cross multiply
    21,009.83x = 28,984.38 × 15,039.32
  4. Step 4: Simplify right side
    21,009.83x = 435,905,365.82
  5. Step 5: Solve for x
    x = 435,905,365.82/21,009.83
  6. Step 6: Final answer
    x = 20,747.69

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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.