Home / 20,815.12-31,220.62-6,774.58

Finding the Fourth Proportional to 20,815.12, 31,220.62 and 6,774.58

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Solution

The fourth proportional to 20,815.12, 31,220.62 and 6,774.58 is: 10,161.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.12 : 31,220.62 = 6,774.58 : x
  2. Step 2: Convert to fraction form
    20,815.12/31,220.62 = 6,774.58/x
  3. Step 3: Cross multiply
    20,815.12x = 31,220.62 × 6,774.58
  4. Step 4: Simplify right side
    20,815.12x = 211,506,397.86
  5. Step 5: Solve for x
    x = 211,506,397.86/20,815.12
  6. Step 6: Final answer
    x = 10,161.19

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1.5x scale

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.