Home / 21,187.41-31,771.13-7,851.21

Finding the Fourth Proportional to 21,187.41, 31,771.13 and 7,851.21

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Solution

The fourth proportional to 21,187.41, 31,771.13 and 7,851.21 is: 11,773.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.41 : 31,771.13 = 7,851.21 : x
  2. Step 2: Convert to fraction form
    21,187.41/31,771.13 = 7,851.21/x
  3. Step 3: Cross multiply
    21,187.41x = 31,771.13 × 7,851.21
  4. Step 4: Simplify right side
    21,187.41x = 249,441,774.31
  5. Step 5: Solve for x
    x = 249,441,774.31/21,187.41
  6. Step 6: Final answer
    x = 11,773.11

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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.