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Finding the Fourth Proportional to 13,080.80, 19,621.20 and 9,970.40

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Solution

The fourth proportional to 13,080.80, 19,621.20 and 9,970.40 is: 14,955.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,080.80 : 19,621.20 = 9,970.40 : x
  2. Step 2: Convert to fraction form
    13,080.80/19,621.20 = 9,970.40/x
  3. Step 3: Cross multiply
    13,080.80x = 19,621.20 × 9,970.40
  4. Step 4: Simplify right side
    13,080.80x = 195,631,212.48
  5. Step 5: Solve for x
    x = 195,631,212.48/13,080.80
  6. Step 6: Final answer
    x = 14,955.60

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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.