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Finding the Fourth Proportional to 40,379.20, 60,439.20 and 28,715.20

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Solution

The fourth proportional to 40,379.20, 60,439.20 and 28,715.20 is: 42,980.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,379.20 : 60,439.20 = 28,715.20 : x
  2. Step 2: Convert to fraction form
    40,379.20/60,439.20 = 28,715.20/x
  3. Step 3: Cross multiply
    40,379.20x = 60,439.20 × 28,715.20
  4. Step 4: Simplify right side
    40,379.20x = 1,735,523,715.84
  5. Step 5: Solve for x
    x = 1,735,523,715.84/40,379.20
  6. Step 6: Final answer
    x = 42,980.64

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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.