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Finding the Fourth Proportional to 28,560.46, 42,840.69 and 7,787.02

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Solution

The fourth proportional to 28,560.46, 42,840.69 and 7,787.02 is: 11,680.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,560.46 : 42,840.69 = 7,787.02 : x
  2. Step 2: Convert to fraction form
    28,560.46/42,840.69 = 7,787.02/x
  3. Step 3: Cross multiply
    28,560.46x = 42,840.69 × 7,787.02
  4. Step 4: Simplify right side
    28,560.46x = 333,601,309.84
  5. Step 5: Solve for x
    x = 333,601,309.84/28,560.46
  6. Step 6: Final answer
    x = 11,680.53

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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.