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Finding the Fourth Proportional to 20,875.86, 31,313.70 and 5,080.70

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Solution

The fourth proportional to 20,875.86, 31,313.70 and 5,080.70 is: 7,621.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.86 : 31,313.70 = 5,080.70 : x
  2. Step 2: Convert to fraction form
    20,875.86/31,313.70 = 5,080.70/x
  3. Step 3: Cross multiply
    20,875.86x = 31,313.70 × 5,080.70
  4. Step 4: Simplify right side
    20,875.86x = 159,095,515.59
  5. Step 5: Solve for x
    x = 159,095,515.59/20,875.86
  6. Step 6: Final answer
    x = 7,621.03

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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.