Home / 20,931.69-31,397.55-13,145.97

Finding the Fourth Proportional to 20,931.69, 31,397.55 and 13,145.97

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Solution

The fourth proportional to 20,931.69, 31,397.55 and 13,145.97 is: 19,718.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.69 : 31,397.55 = 13,145.97 : x
  2. Step 2: Convert to fraction form
    20,931.69/31,397.55 = 13,145.97/x
  3. Step 3: Cross multiply
    20,931.69x = 31,397.55 × 13,145.97
  4. Step 4: Simplify right side
    20,931.69x = 412,751,250.37
  5. Step 5: Solve for x
    x = 412,751,250.37/20,931.69
  6. Step 6: Final answer
    x = 19,718.96

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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.