Home / 15,731.78-21,710.01-8,658.36

Finding the Fourth Proportional to 15,731.78, 21,710.01 and 8,658.36

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Solution

The fourth proportional to 15,731.78, 21,710.01 and 8,658.36 is: 11,948.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,731.78 : 21,710.01 = 8,658.36 : x
  2. Step 2: Convert to fraction form
    15,731.78/21,710.01 = 8,658.36/x
  3. Step 3: Cross multiply
    15,731.78x = 21,710.01 × 8,658.36
  4. Step 4: Simplify right side
    15,731.78x = 187,973,114.81
  5. Step 5: Solve for x
    x = 187,973,114.81/15,731.78
  6. Step 6: Final answer
    x = 11,948.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.