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Finding the Fourth Proportional to 847.65, 1,271.61 and 270.39

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Solution

The fourth proportional to 847.65, 1,271.61 and 270.39 is: 405.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.65 : 1,271.61 = 270.39 : x
  2. Step 2: Convert to fraction form
    847.65/1,271.61 = 270.39/x
  3. Step 3: Cross multiply
    847.65x = 1,271.61 × 270.39
  4. Step 4: Simplify right side
    847.65x = 343,830.63
  5. Step 5: Solve for x
    x = 343,830.63/847.65
  6. Step 6: Final answer
    x = 405.63

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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.