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Finding the Fourth Proportional to 12,790.78, 17,652.54 and 7,485.28

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Solution

The fourth proportional to 12,790.78, 17,652.54 and 7,485.28 is: 10,330.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,790.78 : 17,652.54 = 7,485.28 : x
  2. Step 2: Convert to fraction form
    12,790.78/17,652.54 = 7,485.28/x
  3. Step 3: Cross multiply
    12,790.78x = 17,652.54 × 7,485.28
  4. Step 4: Simplify right side
    12,790.78x = 132,134,204.61
  5. Step 5: Solve for x
    x = 132,134,204.61/12,790.78
  6. Step 6: Final answer
    x = 10,330.43

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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.