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Finding the Fourth Proportional to 28,505.16, 42,757.74 and 7,728.66

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Solution

The fourth proportional to 28,505.16, 42,757.74 and 7,728.66 is: 11,592.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,505.16 : 42,757.74 = 7,728.66 : x
  2. Step 2: Convert to fraction form
    28,505.16/42,757.74 = 7,728.66/x
  3. Step 3: Cross multiply
    28,505.16x = 42,757.74 × 7,728.66
  4. Step 4: Simplify right side
    28,505.16x = 330,460,034.83
  5. Step 5: Solve for x
    x = 330,460,034.83/28,505.16
  6. Step 6: Final answer
    x = 11,592.99

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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.