Home / 21,294.45-31,908.81-13,486.86

Finding the Fourth Proportional to 21,294.45, 31,908.81 and 13,486.86

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Solution

The fourth proportional to 21,294.45, 31,908.81 and 13,486.86 is: 20,209.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,294.45 : 31,908.81 = 13,486.86 : x
  2. Step 2: Convert to fraction form
    21,294.45/31,908.81 = 13,486.86/x
  3. Step 3: Cross multiply
    21,294.45x = 31,908.81 × 13,486.86
  4. Step 4: Simplify right side
    21,294.45x = 430,349,653.24
  5. Step 5: Solve for x
    x = 430,349,653.24/21,294.45
  6. Step 6: Final answer
    x = 20,209.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.