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Finding the Fourth Proportional to 8,478.80, 12,719.40 and 2,634.80

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Solution

The fourth proportional to 8,478.80, 12,719.40 and 2,634.80 is: 3,952.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.80 : 12,719.40 = 2,634.80 : x
  2. Step 2: Convert to fraction form
    8,478.80/12,719.40 = 2,634.80/x
  3. Step 3: Cross multiply
    8,478.80x = 12,719.40 × 2,634.80
  4. Step 4: Simplify right side
    8,478.80x = 33,513,075.12
  5. Step 5: Solve for x
    x = 33,513,075.12/8,478.80
  6. Step 6: Final answer
    x = 3,952.57

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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.