Home / 20,817.78-31,206.96-8,345.58

Finding the Fourth Proportional to 20,817.78, 31,206.96 and 8,345.58

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Solution

The fourth proportional to 20,817.78, 31,206.96 and 8,345.58 is: 12,510.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.78 : 31,206.96 = 8,345.58 : x
  2. Step 2: Convert to fraction form
    20,817.78/31,206.96 = 8,345.58/x
  3. Step 3: Cross multiply
    20,817.78x = 31,206.96 × 8,345.58
  4. Step 4: Simplify right side
    20,817.78x = 260,440,181.24
  5. Step 5: Solve for x
    x = 260,440,181.24/20,817.78
  6. Step 6: Final answer
    x = 12,510.47

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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.