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Finding the Fourth Proportional to 13,980.79, 20,991.84 and 9,329.77

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Solution

The fourth proportional to 13,980.79, 20,991.84 and 9,329.77 is: 14,008.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980.79 : 20,991.84 = 9,329.77 : x
  2. Step 2: Convert to fraction form
    13,980.79/20,991.84 = 9,329.77/x
  3. Step 3: Cross multiply
    13,980.79x = 20,991.84 × 9,329.77
  4. Step 4: Simplify right side
    13,980.79x = 195,849,039.08
  5. Step 5: Solve for x
    x = 195,849,039.08/13,980.79
  6. Step 6: Final answer
    x = 14,008.44

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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.