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Finding the Fourth Proportional to 4,660.80, 6,991.20 and 4,387.20

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Solution

The fourth proportional to 4,660.80, 6,991.20 and 4,387.20 is: 6,580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,660.80 : 6,991.20 = 4,387.20 : x
  2. Step 2: Convert to fraction form
    4,660.80/6,991.20 = 4,387.20/x
  3. Step 3: Cross multiply
    4,660.80x = 6,991.20 × 4,387.20
  4. Step 4: Simplify right side
    4,660.80x = 30,671,792.64
  5. Step 5: Solve for x
    x = 30,671,792.64/4,660.80
  6. Step 6: Final answer
    x = 6,580.80

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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.