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Finding the Fourth Proportional to 21,009.58, 28,984.04 and 15,039.07

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Solution

The fourth proportional to 21,009.58, 28,984.04 and 15,039.07 is: 20,747.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.58 : 28,984.04 = 15,039.07 : x
  2. Step 2: Convert to fraction form
    21,009.58/28,984.04 = 15,039.07/x
  3. Step 3: Cross multiply
    21,009.58x = 28,984.04 × 15,039.07
  4. Step 4: Simplify right side
    21,009.58x = 435,892,931.25
  5. Step 5: Solve for x
    x = 435,892,931.25/21,009.58
  6. Step 6: Final answer
    x = 20,747.34

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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.