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Finding the Fourth Proportional to 12,979.87, 17,910.94 and 7,602.88

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Solution

The fourth proportional to 12,979.87, 17,910.94 and 7,602.88 is: 10,491.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.87 : 17,910.94 = 7,602.88 : x
  2. Step 2: Convert to fraction form
    12,979.87/17,910.94 = 7,602.88/x
  3. Step 3: Cross multiply
    12,979.87x = 17,910.94 × 7,602.88
  4. Step 4: Simplify right side
    12,979.87x = 136,174,727.51
  5. Step 5: Solve for x
    x = 136,174,727.51/12,979.87
  6. Step 6: Final answer
    x = 10,491.22

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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.