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Finding the Fourth Proportional to 1,360.78, 2,041.21 and 436.39

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Solution

The fourth proportional to 1,360.78, 2,041.21 and 436.39 is: 654.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.78 : 2,041.21 = 436.39 : x
  2. Step 2: Convert to fraction form
    1,360.78/2,041.21 = 436.39/x
  3. Step 3: Cross multiply
    1,360.78x = 2,041.21 × 436.39
  4. Step 4: Simplify right side
    1,360.78x = 890,763.63
  5. Step 5: Solve for x
    x = 890,763.63/1,360.78
  6. Step 6: Final answer
    x = 654.60

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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.