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Finding the Fourth Proportional to 28,640.45, 42,952.41 and 9,919.73

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Solution

The fourth proportional to 28,640.45, 42,952.41 and 9,919.73 is: 14,876.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.45 : 42,952.41 = 9,919.73 : x
  2. Step 2: Convert to fraction form
    28,640.45/42,952.41 = 9,919.73/x
  3. Step 3: Cross multiply
    28,640.45x = 42,952.41 × 9,919.73
  4. Step 4: Simplify right side
    28,640.45x = 426,076,417.43
  5. Step 5: Solve for x
    x = 426,076,417.43/28,640.45
  6. Step 6: Final answer
    x = 14,876.73

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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.