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Finding the Fourth Proportional to 12,657.71, 18,990.26 and 5,260.79

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Solution

The fourth proportional to 12,657.71, 18,990.26 and 5,260.79 is: 7,892.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,657.71 : 18,990.26 = 5,260.79 : x
  2. Step 2: Convert to fraction form
    12,657.71/18,990.26 = 5,260.79/x
  3. Step 3: Cross multiply
    12,657.71x = 18,990.26 × 5,260.79
  4. Step 4: Simplify right side
    12,657.71x = 99,903,769.91
  5. Step 5: Solve for x
    x = 99,903,769.91/12,657.71
  6. Step 6: Final answer
    x = 7,892.72

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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.