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Finding the Fourth Proportional to 8,570.40, 12,860.40 and 3,639.20

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Solution

The fourth proportional to 8,570.40, 12,860.40 and 3,639.20 is: 5,460.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,570.40 : 12,860.40 = 3,639.20 : x
  2. Step 2: Convert to fraction form
    8,570.40/12,860.40 = 3,639.20/x
  3. Step 3: Cross multiply
    8,570.40x = 12,860.40 × 3,639.20
  4. Step 4: Simplify right side
    8,570.40x = 46,801,567.68
  5. Step 5: Solve for x
    x = 46,801,567.68/8,570.40
  6. Step 6: Final answer
    x = 5,460.84

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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.