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Finding the Fourth Proportional to 18,912.83, 28,342.51 and 7,812.59

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Solution

The fourth proportional to 18,912.83, 28,342.51 and 7,812.59 is: 11,707.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.83 : 28,342.51 = 7,812.59 : x
  2. Step 2: Convert to fraction form
    18,912.83/28,342.51 = 7,812.59/x
  3. Step 3: Cross multiply
    18,912.83x = 28,342.51 × 7,812.59
  4. Step 4: Simplify right side
    18,912.83x = 221,428,248.96
  5. Step 5: Solve for x
    x = 221,428,248.96/18,912.83
  6. Step 6: Final answer
    x = 11,707.84

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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.