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Finding the Fourth Proportional to 940.95, 1,408.14 and 718.20

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Solution

The fourth proportional to 940.95, 1,408.14 and 718.20 is: 1,074.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.95 : 1,408.14 = 718.20 : x
  2. Step 2: Convert to fraction form
    940.95/1,408.14 = 718.20/x
  3. Step 3: Cross multiply
    940.95x = 1,408.14 × 718.20
  4. Step 4: Simplify right side
    940.95x = 1,011,326.15
  5. Step 5: Solve for x
    x = 1,011,326.15/940.95
  6. Step 6: Final answer
    x = 1,074.79

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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.