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Finding the Fourth Proportional to 13,612.22, 18,779.51 and 7,865.88

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Solution

The fourth proportional to 13,612.22, 18,779.51 and 7,865.88 is: 10,851.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.22 : 18,779.51 = 7,865.88 : x
  2. Step 2: Convert to fraction form
    13,612.22/18,779.51 = 7,865.88/x
  3. Step 3: Cross multiply
    13,612.22x = 18,779.51 × 7,865.88
  4. Step 4: Simplify right side
    13,612.22x = 147,717,347.54
  5. Step 5: Solve for x
    x = 147,717,347.54/13,612.22
  6. Step 6: Final answer
    x = 10,851.82

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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.