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Finding the Fourth Proportional to 20,659.78, 30,984.15 and 8,970.34

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Solution

The fourth proportional to 20,659.78, 30,984.15 and 8,970.34 is: 13,453.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.78 : 30,984.15 = 8,970.34 : x
  2. Step 2: Convert to fraction form
    20,659.78/30,984.15 = 8,970.34/x
  3. Step 3: Cross multiply
    20,659.78x = 30,984.15 × 8,970.34
  4. Step 4: Simplify right side
    20,659.78x = 277,938,360.11
  5. Step 5: Solve for x
    x = 277,938,360.11/20,659.78
  6. Step 6: Final answer
    x = 13,453.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.