Home / 20,804.28-31,208.40-7,656.90

Finding the Fourth Proportional to 20,804.28, 31,208.40 and 7,656.90

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Solution

The fourth proportional to 20,804.28, 31,208.40 and 7,656.90 is: 11,486.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,804.28 : 31,208.40 = 7,656.90 : x
  2. Step 2: Convert to fraction form
    20,804.28/31,208.40 = 7,656.90/x
  3. Step 3: Cross multiply
    20,804.28x = 31,208.40 × 7,656.90
  4. Step 4: Simplify right side
    20,804.28x = 238,959,597.96
  5. Step 5: Solve for x
    x = 238,959,597.96/20,804.28
  6. Step 6: Final answer
    x = 11,486.08

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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.