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Finding the Fourth Proportional to 13,320.60, 19,980.90 and 12,751.80

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Solution

The fourth proportional to 13,320.60, 19,980.90 and 12,751.80 is: 19,127.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,320.60 : 19,980.90 = 12,751.80 : x
  2. Step 2: Convert to fraction form
    13,320.60/19,980.90 = 12,751.80/x
  3. Step 3: Cross multiply
    13,320.60x = 19,980.90 × 12,751.80
  4. Step 4: Simplify right side
    13,320.60x = 254,792,440.62
  5. Step 5: Solve for x
    x = 254,792,440.62/13,320.60
  6. Step 6: Final answer
    x = 19,127.70

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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.