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Finding the Fourth Proportional to 28,479.87, 42,719.81 and 7,704.99

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Solution

The fourth proportional to 28,479.87, 42,719.81 and 7,704.99 is: 11,557.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.87 : 42,719.81 = 7,704.99 : x
  2. Step 2: Convert to fraction form
    28,479.87/42,719.81 = 7,704.99/x
  3. Step 3: Cross multiply
    28,479.87x = 42,719.81 × 7,704.99
  4. Step 4: Simplify right side
    28,479.87x = 329,155,670.33
  5. Step 5: Solve for x
    x = 329,155,670.33/28,479.87
  6. Step 6: Final answer
    x = 11,557.49

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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.