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Finding the Fourth Proportional to 4,719.92, 7,089.48 and 3,990.80

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Solution

The fourth proportional to 4,719.92, 7,089.48 and 3,990.80 is: 5,994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,719.92 : 7,089.48 = 3,990.80 : x
  2. Step 2: Convert to fraction form
    4,719.92/7,089.48 = 3,990.80/x
  3. Step 3: Cross multiply
    4,719.92x = 7,089.48 × 3,990.80
  4. Step 4: Simplify right side
    4,719.92x = 28,292,696.78
  5. Step 5: Solve for x
    x = 28,292,696.78/4,719.92
  6. Step 6: Final answer
    x = 5,994.32

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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.