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Finding the Fourth Proportional to 12,871.78, 19,265.55 and 7,945.36

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Solution

The fourth proportional to 12,871.78, 19,265.55 and 7,945.36 is: 11,892.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,871.78 : 19,265.55 = 7,945.36 : x
  2. Step 2: Convert to fraction form
    12,871.78/19,265.55 = 7,945.36/x
  3. Step 3: Cross multiply
    12,871.78x = 19,265.55 × 7,945.36
  4. Step 4: Simplify right side
    12,871.78x = 153,071,730.35
  5. Step 5: Solve for x
    x = 153,071,730.35/12,871.78
  6. Step 6: Final answer
    x = 11,892.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.