Home / 21,186.54-31,779.86-8,697.87

Finding the Fourth Proportional to 21,186.54, 31,779.86 and 8,697.87

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Solution

The fourth proportional to 21,186.54, 31,779.86 and 8,697.87 is: 13,046.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.54 : 31,779.86 = 8,697.87 : x
  2. Step 2: Convert to fraction form
    21,186.54/31,779.86 = 8,697.87/x
  3. Step 3: Cross multiply
    21,186.54x = 31,779.86 × 8,697.87
  4. Step 4: Simplify right side
    21,186.54x = 276,417,047.41
  5. Step 5: Solve for x
    x = 276,417,047.41/21,186.54
  6. Step 6: Final answer
    x = 13,046.82

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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.