Home / 13,131.15-18,117.75-8,421.81

Finding the Fourth Proportional to 13,131.15, 18,117.75 and 8,421.81

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Solution

The fourth proportional to 13,131.15, 18,117.75 and 8,421.81 is: 11,620.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,131.15 : 18,117.75 = 8,421.81 : x
  2. Step 2: Convert to fraction form
    13,131.15/18,117.75 = 8,421.81/x
  3. Step 3: Cross multiply
    13,131.15x = 18,117.75 × 8,421.81
  4. Step 4: Simplify right side
    13,131.15x = 152,584,248.13
  5. Step 5: Solve for x
    x = 152,584,248.13/13,131.15
  6. Step 6: Final answer
    x = 11,620.02

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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.