Home / 19,986.78-29,980.29-8,890.86

Finding the Fourth Proportional to 19,986.78, 29,980.29 and 8,890.86

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Solution

The fourth proportional to 19,986.78, 29,980.29 and 8,890.86 is: 13,336.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,986.78 : 29,980.29 = 8,890.86 : x
  2. Step 2: Convert to fraction form
    19,986.78/29,980.29 = 8,890.86/x
  3. Step 3: Cross multiply
    19,986.78x = 29,980.29 × 8,890.86
  4. Step 4: Simplify right side
    19,986.78x = 266,550,561.15
  5. Step 5: Solve for x
    x = 266,550,561.15/19,986.78
  6. Step 6: Final answer
    x = 13,336.34

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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.