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Finding the Fourth Proportional to 12,579.57, 17,359.80 and 6,990.57

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Solution

The fourth proportional to 12,579.57, 17,359.80 and 6,990.57 is: 9,646.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,579.57 : 17,359.80 = 6,990.57 : x
  2. Step 2: Convert to fraction form
    12,579.57/17,359.80 = 6,990.57/x
  3. Step 3: Cross multiply
    12,579.57x = 17,359.80 × 6,990.57
  4. Step 4: Simplify right side
    12,579.57x = 121,354,897.09
  5. Step 5: Solve for x
    x = 121,354,897.09/12,579.57
  6. Step 6: Final answer
    x = 9,646.98

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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.