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Finding the Fourth Proportional to 5,315.20, 7,972.80 and 4,991.20

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Solution

The fourth proportional to 5,315.20, 7,972.80 and 4,991.20 is: 7,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,315.20 : 7,972.80 = 4,991.20 : x
  2. Step 2: Convert to fraction form
    5,315.20/7,972.80 = 4,991.20/x
  3. Step 3: Cross multiply
    5,315.20x = 7,972.80 × 4,991.20
  4. Step 4: Simplify right side
    5,315.20x = 39,793,839.36
  5. Step 5: Solve for x
    x = 39,793,839.36/5,315.20
  6. Step 6: Final answer
    x = 7,486.80

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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.