Home / 15,315.86-21,143.76-13,101.53

Finding the Fourth Proportional to 15,315.86, 21,143.76 and 13,101.53

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Solution

The fourth proportional to 15,315.86, 21,143.76 and 13,101.53 is: 18,086.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.86 : 21,143.76 = 13,101.53 : x
  2. Step 2: Convert to fraction form
    15,315.86/21,143.76 = 13,101.53/x
  3. Step 3: Cross multiply
    15,315.86x = 21,143.76 × 13,101.53
  4. Step 4: Simplify right side
    15,315.86x = 277,015,605.95
  5. Step 5: Solve for x
    x = 277,015,605.95/15,315.86
  6. Step 6: Final answer
    x = 18,086.85

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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.