Home / 20,868.10-31,303.28-5,285.86

Finding the Fourth Proportional to 20,868.10, 31,303.28 and 5,285.86

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Solution

The fourth proportional to 20,868.10, 31,303.28 and 5,285.86 is: 7,929.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.10 : 31,303.28 = 5,285.86 : x
  2. Step 2: Convert to fraction form
    20,868.10/31,303.28 = 5,285.86/x
  3. Step 3: Cross multiply
    20,868.10x = 31,303.28 × 5,285.86
  4. Step 4: Simplify right side
    20,868.10x = 165,464,612.32
  5. Step 5: Solve for x
    x = 165,464,612.32/20,868.10
  6. Step 6: Final answer
    x = 7,929.07

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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.