Home / 15,645.64-21,574.32-12,791.68

Finding the Fourth Proportional to 15,645.64, 21,574.32 and 12,791.68

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Solution

The fourth proportional to 15,645.64, 21,574.32 and 12,791.68 is: 17,638.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,645.64 : 21,574.32 = 12,791.68 : x
  2. Step 2: Convert to fraction form
    15,645.64/21,574.32 = 12,791.68/x
  3. Step 3: Cross multiply
    15,645.64x = 21,574.32 × 12,791.68
  4. Step 4: Simplify right side
    15,645.64x = 275,971,797.66
  5. Step 5: Solve for x
    x = 275,971,797.66/15,645.64
  6. Step 6: Final answer
    x = 17,638.89

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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.