Home / 20,731.16-31,102.80-6,690.90

Finding the Fourth Proportional to 20,731.16, 31,102.80 and 6,690.90

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Solution

The fourth proportional to 20,731.16, 31,102.80 and 6,690.90 is: 10,038.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.16 : 31,102.80 = 6,690.90 : x
  2. Step 2: Convert to fraction form
    20,731.16/31,102.80 = 6,690.90/x
  3. Step 3: Cross multiply
    20,731.16x = 31,102.80 × 6,690.90
  4. Step 4: Simplify right side
    20,731.16x = 208,105,724.52
  5. Step 5: Solve for x
    x = 208,105,724.52/20,731.16
  6. Step 6: Final answer
    x = 10,038.31

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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.