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Finding the Fourth Proportional to 3,316.40, 4,974.55 and 851.21

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Solution

The fourth proportional to 3,316.40, 4,974.55 and 851.21 is: 1,276.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,316.40 : 4,974.55 = 851.21 : x
  2. Step 2: Convert to fraction form
    3,316.40/4,974.55 = 851.21/x
  3. Step 3: Cross multiply
    3,316.40x = 4,974.55 × 851.21
  4. Step 4: Simplify right side
    3,316.40x = 4,234,386.71
  5. Step 5: Solve for x
    x = 4,234,386.71/3,316.40
  6. Step 6: Final answer
    x = 1,276.80

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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.