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Finding the Fourth Proportional to 3,900.99, 5,851.35 and 979.32

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Solution

The fourth proportional to 3,900.99, 5,851.35 and 979.32 is: 1,468.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.99 : 5,851.35 = 979.32 : x
  2. Step 2: Convert to fraction form
    3,900.99/5,851.35 = 979.32/x
  3. Step 3: Cross multiply
    3,900.99x = 5,851.35 × 979.32
  4. Step 4: Simplify right side
    3,900.99x = 5,730,344.08
  5. Step 5: Solve for x
    x = 5,730,344.08/3,900.99
  6. Step 6: Final answer
    x = 1,468.95

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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.