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Finding the Fourth Proportional to 12,855.31, 17,739.40 and 7,549.40

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Solution

The fourth proportional to 12,855.31, 17,739.40 and 7,549.40 is: 10,417.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.31 : 17,739.40 = 7,549.40 : x
  2. Step 2: Convert to fraction form
    12,855.31/17,739.40 = 7,549.40/x
  3. Step 3: Cross multiply
    12,855.31x = 17,739.40 × 7,549.40
  4. Step 4: Simplify right side
    12,855.31x = 133,921,826.36
  5. Step 5: Solve for x
    x = 133,921,826.36/12,855.31
  6. Step 6: Final answer
    x = 10,417.63

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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.