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Finding the Fourth Proportional to 1,380.39, 2,070.84 and 649.98

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Solution

The fourth proportional to 1,380.39, 2,070.84 and 649.98 is: 975.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.39 : 2,070.84 = 649.98 : x
  2. Step 2: Convert to fraction form
    1,380.39/2,070.84 = 649.98/x
  3. Step 3: Cross multiply
    1,380.39x = 2,070.84 × 649.98
  4. Step 4: Simplify right side
    1,380.39x = 1,346,004.58
  5. Step 5: Solve for x
    x = 1,346,004.58/1,380.39
  6. Step 6: Final answer
    x = 975.09

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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.