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Finding the Fourth Proportional to 715.70, 1,074.35 and 668.70

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Solution

The fourth proportional to 715.70, 1,074.35 and 668.70 is: 1,003.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.70 : 1,074.35 = 668.70 : x
  2. Step 2: Convert to fraction form
    715.70/1,074.35 = 668.70/x
  3. Step 3: Cross multiply
    715.70x = 1,074.35 × 668.70
  4. Step 4: Simplify right side
    715.70x = 718,417.85
  5. Step 5: Solve for x
    x = 718,417.85/715.70
  6. Step 6: Final answer
    x = 1,003.80

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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.