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Finding the Fourth Proportional to 12,881.92, 17,776.20 and 7,215.68

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Solution

The fourth proportional to 12,881.92, 17,776.20 and 7,215.68 is: 9,957.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881.92 : 17,776.20 = 7,215.68 : x
  2. Step 2: Convert to fraction form
    12,881.92/17,776.20 = 7,215.68/x
  3. Step 3: Cross multiply
    12,881.92x = 17,776.20 × 7,215.68
  4. Step 4: Simplify right side
    12,881.92x = 128,267,370.82
  5. Step 5: Solve for x
    x = 128,267,370.82/12,881.92
  6. Step 6: Final answer
    x = 9,957.16

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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.