Home / 21,315.63-31,948.53-12,556.69

Finding the Fourth Proportional to 21,315.63, 31,948.53 and 12,556.69

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Solution

The fourth proportional to 21,315.63, 31,948.53 and 12,556.69 is: 18,820.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.63 : 31,948.53 = 12,556.69 : x
  2. Step 2: Convert to fraction form
    21,315.63/31,948.53 = 12,556.69/x
  3. Step 3: Cross multiply
    21,315.63x = 31,948.53 × 12,556.69
  4. Step 4: Simplify right side
    21,315.63x = 401,167,787.17
  5. Step 5: Solve for x
    x = 401,167,787.17/21,315.63
  6. Step 6: Final answer
    x = 18,820.36

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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.