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Finding the Fourth Proportional to 12,418.71, 17,138.16 and 7,385.64

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Solution

The fourth proportional to 12,418.71, 17,138.16 and 7,385.64 is: 10,192.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,418.71 : 17,138.16 = 7,385.64 : x
  2. Step 2: Convert to fraction form
    12,418.71/17,138.16 = 7,385.64/x
  3. Step 3: Cross multiply
    12,418.71x = 17,138.16 × 7,385.64
  4. Step 4: Simplify right side
    12,418.71x = 126,576,280.02
  5. Step 5: Solve for x
    x = 126,576,280.02/12,418.71
  6. Step 6: Final answer
    x = 10,192.39

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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.