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Finding the Fourth Proportional to 1,380.42, 2,070.42 and 393.30

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Solution

The fourth proportional to 1,380.42, 2,070.42 and 393.30 is: 589.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.42 : 2,070.42 = 393.30 : x
  2. Step 2: Convert to fraction form
    1,380.42/2,070.42 = 393.30/x
  3. Step 3: Cross multiply
    1,380.42x = 2,070.42 × 393.30
  4. Step 4: Simplify right side
    1,380.42x = 814,296.19
  5. Step 5: Solve for x
    x = 814,296.19/1,380.42
  6. Step 6: Final answer
    x = 589.89

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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.