Home / 21,330.90-29,438.10-12,378.42

Finding the Fourth Proportional to 21,330.90, 29,438.10 and 12,378.42

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Solution

The fourth proportional to 21,330.90, 29,438.10 and 12,378.42 is: 17,083.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,330.90 : 29,438.10 = 12,378.42 : x
  2. Step 2: Convert to fraction form
    21,330.90/29,438.10 = 12,378.42/x
  3. Step 3: Cross multiply
    21,330.90x = 29,438.10 × 12,378.42
  4. Step 4: Simplify right side
    21,330.90x = 364,397,165.80
  5. Step 5: Solve for x
    x = 364,397,165.80/21,330.90
  6. Step 6: Final answer
    x = 17,083.07

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1.5x scale

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.