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Finding the Fourth Proportional to 4,572.80, 6,859.20 and 4,378.40

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Solution

The fourth proportional to 4,572.80, 6,859.20 and 4,378.40 is: 6,567.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,572.80 : 6,859.20 = 4,378.40 : x
  2. Step 2: Convert to fraction form
    4,572.80/6,859.20 = 4,378.40/x
  3. Step 3: Cross multiply
    4,572.80x = 6,859.20 × 4,378.40
  4. Step 4: Simplify right side
    4,572.80x = 30,032,321.28
  5. Step 5: Solve for x
    x = 30,032,321.28/4,572.80
  6. Step 6: Final answer
    x = 6,567.60

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Similar ratio
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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.