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Finding the Fourth Proportional to 12,618.31, 17,419.57 and 9,779.31

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Solution

The fourth proportional to 12,618.31, 17,419.57 and 9,779.31 is: 13,500.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,618.31 : 17,419.57 = 9,779.31 : x
  2. Step 2: Convert to fraction form
    12,618.31/17,419.57 = 9,779.31/x
  3. Step 3: Cross multiply
    12,618.31x = 17,419.57 × 9,779.31
  4. Step 4: Simplify right side
    12,618.31x = 170,351,315.41
  5. Step 5: Solve for x
    x = 170,351,315.41/12,618.31
  6. Step 6: Final answer
    x = 13,500.33

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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.