Home / 13,129.65-18,115.69-8,420.31

Finding the Fourth Proportional to 13,129.65, 18,115.69 and 8,420.31

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Solution

The fourth proportional to 13,129.65, 18,115.69 and 8,420.31 is: 11,617.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.65 : 18,115.69 = 8,420.31 : x
  2. Step 2: Convert to fraction form
    13,129.65/18,115.69 = 8,420.31/x
  3. Step 3: Cross multiply
    13,129.65x = 18,115.69 × 8,420.31
  4. Step 4: Simplify right side
    13,129.65x = 152,539,725.66
  5. Step 5: Solve for x
    x = 152,539,725.66/13,129.65
  6. Step 6: Final answer
    x = 11,617.96

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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.