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Finding the Fourth Proportional to 12,681.60, 18,998.18 and 7,118.08

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Solution

The fourth proportional to 12,681.60, 18,998.18 and 7,118.08 is: 10,663.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,681.60 : 18,998.18 = 7,118.08 : x
  2. Step 2: Convert to fraction form
    12,681.60/18,998.18 = 7,118.08/x
  3. Step 3: Cross multiply
    12,681.60x = 18,998.18 × 7,118.08
  4. Step 4: Simplify right side
    12,681.60x = 135,230,565.09
  5. Step 5: Solve for x
    x = 135,230,565.09/12,681.60
  6. Step 6: Final answer
    x = 10,663.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.