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Finding the Fourth Proportional to 12,884.79, 17,779.78 and 8,855.16

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Solution

The fourth proportional to 12,884.79, 17,779.78 and 8,855.16 is: 12,219.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,884.79 : 17,779.78 = 8,855.16 : x
  2. Step 2: Convert to fraction form
    12,884.79/17,779.78 = 8,855.16/x
  3. Step 3: Cross multiply
    12,884.79x = 17,779.78 × 8,855.16
  4. Step 4: Simplify right side
    12,884.79x = 157,442,741.06
  5. Step 5: Solve for x
    x = 157,442,741.06/12,884.79
  6. Step 6: Final answer
    x = 12,219.27

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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.