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Finding the Fourth Proportional to 12,881.68, 17,777.79 and 7,216.31

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Solution

The fourth proportional to 12,881.68, 17,777.79 and 7,216.31 is: 9,959.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881.68 : 17,777.79 = 7,216.31 : x
  2. Step 2: Convert to fraction form
    12,881.68/17,777.79 = 7,216.31/x
  3. Step 3: Cross multiply
    12,881.68x = 17,777.79 × 7,216.31
  4. Step 4: Simplify right side
    12,881.68x = 128,290,088.20
  5. Step 5: Solve for x
    x = 128,290,088.20/12,881.68
  6. Step 6: Final answer
    x = 9,959.11

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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.