Home / 21,438.80-29,585.48-11,878.72

Finding the Fourth Proportional to 21,438.80, 29,585.48 and 11,878.72

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Solution

The fourth proportional to 21,438.80, 29,585.48 and 11,878.72 is: 16,392.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438.80 : 29,585.48 = 11,878.72 : x
  2. Step 2: Convert to fraction form
    21,438.80/29,585.48 = 11,878.72/x
  3. Step 3: Cross multiply
    21,438.80x = 29,585.48 × 11,878.72
  4. Step 4: Simplify right side
    21,438.80x = 351,437,632.99
  5. Step 5: Solve for x
    x = 351,437,632.99/21,438.80
  6. Step 6: Final answer
    x = 16,392.60

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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.