Home / 11,135.80-15,368.70-6,420.25

Finding the Fourth Proportional to 11,135.80, 15,368.70 and 6,420.25

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Solution

The fourth proportional to 11,135.80, 15,368.70 and 6,420.25 is: 8,860.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,135.80 : 15,368.70 = 6,420.25 : x
  2. Step 2: Convert to fraction form
    11,135.80/15,368.70 = 6,420.25/x
  3. Step 3: Cross multiply
    11,135.80x = 15,368.70 × 6,420.25
  4. Step 4: Simplify right side
    11,135.80x = 98,670,896.18
  5. Step 5: Solve for x
    x = 98,670,896.18/11,135.80
  6. Step 6: Final answer
    x = 8,860.69

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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.