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Finding the Fourth Proportional to 1,214.58, 1,820.34 and 520.80

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Solution

The fourth proportional to 1,214.58, 1,820.34 and 520.80 is: 780.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.58 : 1,820.34 = 520.80 : x
  2. Step 2: Convert to fraction form
    1,214.58/1,820.34 = 520.80/x
  3. Step 3: Cross multiply
    1,214.58x = 1,820.34 × 520.80
  4. Step 4: Simplify right side
    1,214.58x = 948,033.07
  5. Step 5: Solve for x
    x = 948,033.07/1,214.58
  6. Step 6: Final answer
    x = 780.54

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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.