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Finding the Fourth Proportional to 1,214.58, 1,820.42 and 720.30

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Solution

The fourth proportional to 1,214.58, 1,820.42 and 720.30 is: 1,079.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.58 : 1,820.42 = 720.30 : x
  2. Step 2: Convert to fraction form
    1,214.58/1,820.42 = 720.30/x
  3. Step 3: Cross multiply
    1,214.58x = 1,820.42 × 720.30
  4. Step 4: Simplify right side
    1,214.58x = 1,311,248.53
  5. Step 5: Solve for x
    x = 1,311,248.53/1,214.58
  6. Step 6: Final answer
    x = 1,079.59

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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.