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Finding the Fourth Proportional to 12,689.10, 17,479.04 and 9,699.90

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Solution

The fourth proportional to 12,689.10, 17,479.04 and 9,699.90 is: 13,361.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.10 : 17,479.04 = 9,699.90 : x
  2. Step 2: Convert to fraction form
    12,689.10/17,479.04 = 9,699.90/x
  3. Step 3: Cross multiply
    12,689.10x = 17,479.04 × 9,699.90
  4. Step 4: Simplify right side
    12,689.10x = 169,544,940.10
  5. Step 5: Solve for x
    x = 169,544,940.10/12,689.10
  6. Step 6: Final answer
    x = 13,361.46

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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.