Home / 15,780.86-21,778.66-9,069.16

Finding the Fourth Proportional to 15,780.86, 21,778.66 and 9,069.16

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Solution

The fourth proportional to 15,780.86, 21,778.66 and 9,069.16 is: 12,516.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.86 : 21,778.66 = 9,069.16 : x
  2. Step 2: Convert to fraction form
    15,780.86/21,778.66 = 9,069.16/x
  3. Step 3: Cross multiply
    15,780.86x = 21,778.66 × 9,069.16
  4. Step 4: Simplify right side
    15,780.86x = 197,514,152.13
  5. Step 5: Solve for x
    x = 197,514,152.13/15,780.86
  6. Step 6: Final answer
    x = 12,516.06

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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.