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Finding the Fourth Proportional to 13,320.80, 19,981.20 and 8,374.40

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Solution

The fourth proportional to 13,320.80, 19,981.20 and 8,374.40 is: 12,561.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,320.80 : 19,981.20 = 8,374.40 : x
  2. Step 2: Convert to fraction form
    13,320.80/19,981.20 = 8,374.40/x
  3. Step 3: Cross multiply
    13,320.80x = 19,981.20 × 8,374.40
  4. Step 4: Simplify right side
    13,320.80x = 167,330,561.28
  5. Step 5: Solve for x
    x = 167,330,561.28/13,320.80
  6. Step 6: Final answer
    x = 12,561.60

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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.