Home / 21,078.87-31,633.86-9,985.54

Finding the Fourth Proportional to 21,078.87, 31,633.86 and 9,985.54

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Solution

The fourth proportional to 21,078.87, 31,633.86 and 9,985.54 is: 14,985.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.87 : 31,633.86 = 9,985.54 : x
  2. Step 2: Convert to fraction form
    21,078.87/31,633.86 = 9,985.54/x
  3. Step 3: Cross multiply
    21,078.87x = 31,633.86 × 9,985.54
  4. Step 4: Simplify right side
    21,078.87x = 315,881,174.38
  5. Step 5: Solve for x
    x = 315,881,174.38/21,078.87
  6. Step 6: Final answer
    x = 14,985.68

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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.