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Finding the Fourth Proportional to 759.37, 1,139.05 and 272.45

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Solution

The fourth proportional to 759.37, 1,139.05 and 272.45 is: 408.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.37 : 1,139.05 = 272.45 : x
  2. Step 2: Convert to fraction form
    759.37/1,139.05 = 272.45/x
  3. Step 3: Cross multiply
    759.37x = 1,139.05 × 272.45
  4. Step 4: Simplify right side
    759.37x = 310,332.81
  5. Step 5: Solve for x
    x = 310,332.81/759.37
  6. Step 6: Final answer
    x = 408.67

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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.