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Finding the Fourth Proportional to 28,461.38, 39,277.31 and 15,886.13

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Solution

The fourth proportional to 28,461.38, 39,277.31 and 15,886.13 is: 21,923.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,461.38 : 39,277.31 = 15,886.13 : x
  2. Step 2: Convert to fraction form
    28,461.38/39,277.31 = 15,886.13/x
  3. Step 3: Cross multiply
    28,461.38x = 39,277.31 × 15,886.13
  4. Step 4: Simplify right side
    28,461.38x = 623,964,176.89
  5. Step 5: Solve for x
    x = 623,964,176.89/28,461.38
  6. Step 6: Final answer
    x = 21,923.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.