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Finding the Fourth Proportional to 18,731.45, 28,110.99 and 8,870.71

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Solution

The fourth proportional to 18,731.45, 28,110.99 and 8,870.71 is: 13,312.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.45 : 28,110.99 = 8,870.71 : x
  2. Step 2: Convert to fraction form
    18,731.45/28,110.99 = 8,870.71/x
  3. Step 3: Cross multiply
    18,731.45x = 28,110.99 × 8,870.71
  4. Step 4: Simplify right side
    18,731.45x = 249,364,403.09
  5. Step 5: Solve for x
    x = 249,364,403.09/18,731.45
  6. Step 6: Final answer
    x = 13,312.61

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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.