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Finding the Fourth Proportional to 28,639.85, 42,962.67 and 9,919.85

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Solution

The fourth proportional to 28,639.85, 42,962.67 and 9,919.85 is: 14,880.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,639.85 : 42,962.67 = 9,919.85 : x
  2. Step 2: Convert to fraction form
    28,639.85/42,962.67 = 9,919.85/x
  3. Step 3: Cross multiply
    28,639.85x = 42,962.67 × 9,919.85
  4. Step 4: Simplify right side
    28,639.85x = 426,183,027.19
  5. Step 5: Solve for x
    x = 426,183,027.19/28,639.85
  6. Step 6: Final answer
    x = 14,880.77

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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.