Home / 20,865.72-31,289.07-9,013.90

Finding the Fourth Proportional to 20,865.72, 31,289.07 and 9,013.90

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Solution

The fourth proportional to 20,865.72, 31,289.07 and 9,013.90 is: 13,516.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.72 : 31,289.07 = 9,013.90 : x
  2. Step 2: Convert to fraction form
    20,865.72/31,289.07 = 9,013.90/x
  3. Step 3: Cross multiply
    20,865.72x = 31,289.07 × 9,013.90
  4. Step 4: Simplify right side
    20,865.72x = 282,036,548.07
  5. Step 5: Solve for x
    x = 282,036,548.07/20,865.72
  6. Step 6: Final answer
    x = 13,516.74

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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.