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Finding the Fourth Proportional to 13,287.80, 18,331.08 and 7,973.48

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Solution

The fourth proportional to 13,287.80, 18,331.08 and 7,973.48 is: 10,999.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,287.80 : 18,331.08 = 7,973.48 : x
  2. Step 2: Convert to fraction form
    13,287.80/18,331.08 = 7,973.48/x
  3. Step 3: Cross multiply
    13,287.80x = 18,331.08 × 7,973.48
  4. Step 4: Simplify right side
    13,287.80x = 146,162,499.76
  5. Step 5: Solve for x
    x = 146,162,499.76/13,287.80
  6. Step 6: Final answer
    x = 10,999.75

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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.