Home / 12,135.75-18,210.70-5,115.33

Finding the Fourth Proportional to 12,135.75, 18,210.70 and 5,115.33

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Solution

The fourth proportional to 12,135.75, 18,210.70 and 5,115.33 is: 7,675.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.75 : 18,210.70 = 5,115.33 : x
  2. Step 2: Convert to fraction form
    12,135.75/18,210.70 = 5,115.33/x
  3. Step 3: Cross multiply
    12,135.75x = 18,210.70 × 5,115.33
  4. Step 4: Simplify right side
    12,135.75x = 93,153,714.45
  5. Step 5: Solve for x
    x = 93,153,714.45/12,135.75
  6. Step 6: Final answer
    x = 7,675.98

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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.