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Finding the Fourth Proportional to 12,398.88, 18,671.64 and 8,960.16

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Solution

The fourth proportional to 12,398.88, 18,671.64 and 8,960.16 is: 13,493.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,398.88 : 18,671.64 = 8,960.16 : x
  2. Step 2: Convert to fraction form
    12,398.88/18,671.64 = 8,960.16/x
  3. Step 3: Cross multiply
    12,398.88x = 18,671.64 × 8,960.16
  4. Step 4: Simplify right side
    12,398.88x = 167,300,881.86
  5. Step 5: Solve for x
    x = 167,300,881.86/12,398.88
  6. Step 6: Final answer
    x = 13,493.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.