Home / 20,886.65-31,345.54-8,406.78

Finding the Fourth Proportional to 20,886.65, 31,345.54 and 8,406.78

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Solution

The fourth proportional to 20,886.65, 31,345.54 and 8,406.78 is: 12,616.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.65 : 31,345.54 = 8,406.78 : x
  2. Step 2: Convert to fraction form
    20,886.65/31,345.54 = 8,406.78/x
  3. Step 3: Cross multiply
    20,886.65x = 31,345.54 × 8,406.78
  4. Step 4: Simplify right side
    20,886.65x = 263,515,058.76
  5. Step 5: Solve for x
    x = 263,515,058.76/20,886.65
  6. Step 6: Final answer
    x = 12,616.43

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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.