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Finding the Fourth Proportional to 18,976.71, 28,465.02 and 5,125.71

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Solution

The fourth proportional to 18,976.71, 28,465.02 and 5,125.71 is: 7,688.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,976.71 : 28,465.02 = 5,125.71 : x
  2. Step 2: Convert to fraction form
    18,976.71/28,465.02 = 5,125.71/x
  3. Step 3: Cross multiply
    18,976.71x = 28,465.02 × 5,125.71
  4. Step 4: Simplify right side
    18,976.71x = 145,903,437.66
  5. Step 5: Solve for x
    x = 145,903,437.66/18,976.71
  6. Step 6: Final answer
    x = 7,688.55

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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.