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Finding the Fourth Proportional to 28,379.64, 42,571.91 and 7,319.50

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Solution

The fourth proportional to 28,379.64, 42,571.91 and 7,319.50 is: 10,979.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.64 : 42,571.91 = 7,319.50 : x
  2. Step 2: Convert to fraction form
    28,379.64/42,571.91 = 7,319.50/x
  3. Step 3: Cross multiply
    28,379.64x = 42,571.91 × 7,319.50
  4. Step 4: Simplify right side
    28,379.64x = 311,605,007.11
  5. Step 5: Solve for x
    x = 311,605,007.11/28,379.64
  6. Step 6: Final answer
    x = 10,979.88

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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.