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Finding the Fourth Proportional to 1,379.93, 2,070.86 and 649.58

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Solution

The fourth proportional to 1,379.93, 2,070.86 and 649.58 is: 974.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.93 : 2,070.86 = 649.58 : x
  2. Step 2: Convert to fraction form
    1,379.93/2,070.86 = 649.58/x
  3. Step 3: Cross multiply
    1,379.93x = 2,070.86 × 649.58
  4. Step 4: Simplify right side
    1,379.93x = 1,345,175.64
  5. Step 5: Solve for x
    x = 1,345,175.64/1,379.93
  6. Step 6: Final answer
    x = 974.82

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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.