Home / 12,738.72-17,578.80-7,148.64

Finding the Fourth Proportional to 12,738.72, 17,578.80 and 7,148.64

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Solution

The fourth proportional to 12,738.72, 17,578.80 and 7,148.64 is: 9,864.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,738.72 : 17,578.80 = 7,148.64 : x
  2. Step 2: Convert to fraction form
    12,738.72/17,578.80 = 7,148.64/x
  3. Step 3: Cross multiply
    12,738.72x = 17,578.80 × 7,148.64
  4. Step 4: Simplify right side
    12,738.72x = 125,664,512.83
  5. Step 5: Solve for x
    x = 125,664,512.83/12,738.72
  6. Step 6: Final answer
    x = 9,864.77

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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.