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Finding the Fourth Proportional to 1,380.83, 2,070.32 and 547.34

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Solution

The fourth proportional to 1,380.83, 2,070.32 and 547.34 is: 820.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.83 : 2,070.32 = 547.34 : x
  2. Step 2: Convert to fraction form
    1,380.83/2,070.32 = 547.34/x
  3. Step 3: Cross multiply
    1,380.83x = 2,070.32 × 547.34
  4. Step 4: Simplify right side
    1,380.83x = 1,133,166.21
  5. Step 5: Solve for x
    x = 1,133,166.21/1,380.83
  6. Step 6: Final answer
    x = 820.64

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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.