Home / 15,518.99-21,438-13,839.86

Finding the Fourth Proportional to 15,518.99, 21,438 and 13,839.86

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Solution

The fourth proportional to 15,518.99, 21,438 and 13,839.86 is: 19,118.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,518.99 : 21,438 = 13,839.86 : x
  2. Step 2: Convert to fraction form
    15,518.99/21,438 = 13,839.86/x
  3. Step 3: Cross multiply
    15,518.99x = 21,438 × 13,839.86
  4. Step 4: Simplify right side
    15,518.99x = 296,698,972.28
  5. Step 5: Solve for x
    x = 296,698,972.28/15,518.99
  6. Step 6: Final answer
    x = 19,118.44

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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.