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Finding the Fourth Proportional to 847.68, 1,271.44 and 231.40

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Solution

The fourth proportional to 847.68, 1,271.44 and 231.40 is: 347.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.68 : 1,271.44 = 231.40 : x
  2. Step 2: Convert to fraction form
    847.68/1,271.44 = 231.40/x
  3. Step 3: Cross multiply
    847.68x = 1,271.44 × 231.40
  4. Step 4: Simplify right side
    847.68x = 294,211.22
  5. Step 5: Solve for x
    x = 294,211.22/847.68
  6. Step 6: Final answer
    x = 347.08

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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.