Home / 20,685.75-31,038.86-8,205.47

Finding the Fourth Proportional to 20,685.75, 31,038.86 and 8,205.47

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Solution

The fourth proportional to 20,685.75, 31,038.86 and 8,205.47 is: 12,312.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.75 : 31,038.86 = 8,205.47 : x
  2. Step 2: Convert to fraction form
    20,685.75/31,038.86 = 8,205.47/x
  3. Step 3: Cross multiply
    20,685.75x = 31,038.86 × 8,205.47
  4. Step 4: Simplify right side
    20,685.75x = 254,688,416.28
  5. Step 5: Solve for x
    x = 254,688,416.28/20,685.75
  6. Step 6: Final answer
    x = 12,312.27

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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.