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Finding the Fourth Proportional to 28,560.32, 42,840.04 and 7,783.76

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Solution

The fourth proportional to 28,560.32, 42,840.04 and 7,783.76 is: 11,675.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,560.32 : 42,840.04 = 7,783.76 : x
  2. Step 2: Convert to fraction form
    28,560.32/42,840.04 = 7,783.76/x
  3. Step 3: Cross multiply
    28,560.32x = 42,840.04 × 7,783.76
  4. Step 4: Simplify right side
    28,560.32x = 333,456,589.75
  5. Step 5: Solve for x
    x = 333,456,589.75/28,560.32
  6. Step 6: Final answer
    x = 11,675.52

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Double scale
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Similar ratio
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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.