Home / 21,045.38-31,559.82-7,890.58

Finding the Fourth Proportional to 21,045.38, 31,559.82 and 7,890.58

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Solution

The fourth proportional to 21,045.38, 31,559.82 and 7,890.58 is: 11,832.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,045.38 : 31,559.82 = 7,890.58 : x
  2. Step 2: Convert to fraction form
    21,045.38/31,559.82 = 7,890.58/x
  3. Step 3: Cross multiply
    21,045.38x = 31,559.82 × 7,890.58
  4. Step 4: Simplify right side
    21,045.38x = 249,025,284.50
  5. Step 5: Solve for x
    x = 249,025,284.50/21,045.38
  6. Step 6: Final answer
    x = 11,832.78

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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.