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Finding the Fourth Proportional to 13,959.60, 20,911.05 and 8,678.40

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Solution

The fourth proportional to 13,959.60, 20,911.05 and 8,678.40 is: 12,999.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,959.60 : 20,911.05 = 8,678.40 : x
  2. Step 2: Convert to fraction form
    13,959.60/20,911.05 = 8,678.40/x
  3. Step 3: Cross multiply
    13,959.60x = 20,911.05 × 8,678.40
  4. Step 4: Simplify right side
    13,959.60x = 181,474,456.32
  5. Step 5: Solve for x
    x = 181,474,456.32/13,959.60
  6. Step 6: Final answer
    x = 12,999.98

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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.