Home / 20,702.91-31,054.08-5,120.55

Finding the Fourth Proportional to 20,702.91, 31,054.08 and 5,120.55

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Solution

The fourth proportional to 20,702.91, 31,054.08 and 5,120.55 is: 7,680.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,702.91 : 31,054.08 = 5,120.55 : x
  2. Step 2: Convert to fraction form
    20,702.91/31,054.08 = 5,120.55/x
  3. Step 3: Cross multiply
    20,702.91x = 31,054.08 × 5,120.55
  4. Step 4: Simplify right side
    20,702.91x = 159,013,969.34
  5. Step 5: Solve for x
    x = 159,013,969.34/20,702.91
  6. Step 6: Final answer
    x = 7,680.75

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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.