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Finding the Fourth Proportional to 12,962.61, 17,863.42 and 9,420.21

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Solution

The fourth proportional to 12,962.61, 17,863.42 and 9,420.21 is: 12,981.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,962.61 : 17,863.42 = 9,420.21 : x
  2. Step 2: Convert to fraction form
    12,962.61/17,863.42 = 9,420.21/x
  3. Step 3: Cross multiply
    12,962.61x = 17,863.42 × 9,420.21
  4. Step 4: Simplify right side
    12,962.61x = 168,277,167.72
  5. Step 5: Solve for x
    x = 168,277,167.72/12,962.61
  6. Step 6: Final answer
    x = 12,981.73

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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.