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Finding the Fourth Proportional to 5,712.80, 8,569.20 and 3,120.80

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Solution

The fourth proportional to 5,712.80, 8,569.20 and 3,120.80 is: 4,681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,712.80 : 8,569.20 = 3,120.80 : x
  2. Step 2: Convert to fraction form
    5,712.80/8,569.20 = 3,120.80/x
  3. Step 3: Cross multiply
    5,712.80x = 8,569.20 × 3,120.80
  4. Step 4: Simplify right side
    5,712.80x = 26,742,759.36
  5. Step 5: Solve for x
    x = 26,742,759.36/5,712.80
  6. Step 6: Final answer
    x = 4,681.20

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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.