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Finding the Fourth Proportional to 940.12, 1,405.86 and 695.32

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Solution

The fourth proportional to 940.12, 1,405.86 and 695.32 is: 1,039.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.12 : 1,405.86 = 695.32 : x
  2. Step 2: Convert to fraction form
    940.12/1,405.86 = 695.32/x
  3. Step 3: Cross multiply
    940.12x = 1,405.86 × 695.32
  4. Step 4: Simplify right side
    940.12x = 977,522.58
  5. Step 5: Solve for x
    x = 977,522.58/940.12
  6. Step 6: Final answer
    x = 1,039.78

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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.