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Finding the Fourth Proportional to 28,642.08, 42,963.04 and 8,921.76

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Solution

The fourth proportional to 28,642.08, 42,963.04 and 8,921.76 is: 13,382.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,642.08 : 42,963.04 = 8,921.76 : x
  2. Step 2: Convert to fraction form
    28,642.08/42,963.04 = 8,921.76/x
  3. Step 3: Cross multiply
    28,642.08x = 42,963.04 × 8,921.76
  4. Step 4: Simplify right side
    28,642.08x = 383,305,931.75
  5. Step 5: Solve for x
    x = 383,305,931.75/28,642.08
  6. Step 6: Final answer
    x = 13,382.62

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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.