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Finding the Fourth Proportional to 28,560.84, 42,836.86 and 7,785.96

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Solution

The fourth proportional to 28,560.84, 42,836.86 and 7,785.96 is: 11,677.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,560.84 : 42,836.86 = 7,785.96 : x
  2. Step 2: Convert to fraction form
    28,560.84/42,836.86 = 7,785.96/x
  3. Step 3: Cross multiply
    28,560.84x = 42,836.86 × 7,785.96
  4. Step 4: Simplify right side
    28,560.84x = 333,526,078.49
  5. Step 5: Solve for x
    x = 333,526,078.49/28,560.84
  6. Step 6: Final answer
    x = 11,677.74

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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.