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Finding the Fourth Proportional to 13,979.79, 20,990.34 and 9,328.77

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Solution

The fourth proportional to 13,979.79, 20,990.34 and 9,328.77 is: 14,006.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.79 : 20,990.34 = 9,328.77 : x
  2. Step 2: Convert to fraction form
    13,979.79/20,990.34 = 9,328.77/x
  3. Step 3: Cross multiply
    13,979.79x = 20,990.34 × 9,328.77
  4. Step 4: Simplify right side
    13,979.79x = 195,814,054.08
  5. Step 5: Solve for x
    x = 195,814,054.08/13,979.79
  6. Step 6: Final answer
    x = 14,006.94

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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.