Home / 20,878.75-31,303.25-9,779.36

Finding the Fourth Proportional to 20,878.75, 31,303.25 and 9,779.36

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Solution

The fourth proportional to 20,878.75, 31,303.25 and 9,779.36 is: 14,662.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.75 : 31,303.25 = 9,779.36 : x
  2. Step 2: Convert to fraction form
    20,878.75/31,303.25 = 9,779.36/x
  3. Step 3: Cross multiply
    20,878.75x = 31,303.25 × 9,779.36
  4. Step 4: Simplify right side
    20,878.75x = 306,125,702.02
  5. Step 5: Solve for x
    x = 306,125,702.02/20,878.75
  6. Step 6: Final answer
    x = 14,662.07

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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.