Home / 12,129.12-16,742.61-7,655.81

Finding the Fourth Proportional to 12,129.12, 16,742.61 and 7,655.81

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Solution

The fourth proportional to 12,129.12, 16,742.61 and 7,655.81 is: 10,567.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,129.12 : 16,742.61 = 7,655.81 : x
  2. Step 2: Convert to fraction form
    12,129.12/16,742.61 = 7,655.81/x
  3. Step 3: Cross multiply
    12,129.12x = 16,742.61 × 7,655.81
  4. Step 4: Simplify right side
    12,129.12x = 128,178,157.35
  5. Step 5: Solve for x
    x = 128,178,157.35/12,129.12
  6. Step 6: Final answer
    x = 10,567.80

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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.