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Finding the Fourth Proportional to 28,485.62, 42,731.84 and 11,856.88

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Solution

The fourth proportional to 28,485.62, 42,731.84 and 11,856.88 is: 17,786.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,485.62 : 42,731.84 = 11,856.88 : x
  2. Step 2: Convert to fraction form
    28,485.62/42,731.84 = 11,856.88/x
  3. Step 3: Cross multiply
    28,485.62x = 42,731.84 × 11,856.88
  4. Step 4: Simplify right side
    28,485.62x = 506,666,299.06
  5. Step 5: Solve for x
    x = 506,666,299.06/28,485.62
  6. Step 6: Final answer
    x = 17,786.74

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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.