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Finding the Fourth Proportional to 12,420.78, 17,138.79 and 7,042.92

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Solution

The fourth proportional to 12,420.78, 17,138.79 and 7,042.92 is: 9,718.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.78 : 17,138.79 = 7,042.92 : x
  2. Step 2: Convert to fraction form
    12,420.78/17,138.79 = 7,042.92/x
  3. Step 3: Cross multiply
    12,420.78x = 17,138.79 × 7,042.92
  4. Step 4: Simplify right side
    12,420.78x = 120,707,126.87
  5. Step 5: Solve for x
    x = 120,707,126.87/12,420.78
  6. Step 6: Final answer
    x = 9,718.16

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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.