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Finding the Fourth Proportional to 847.98, 1,271.34 and 628.74

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Solution

The fourth proportional to 847.98, 1,271.34 and 628.74 is: 942.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.98 : 1,271.34 = 628.74 : x
  2. Step 2: Convert to fraction form
    847.98/1,271.34 = 628.74/x
  3. Step 3: Cross multiply
    847.98x = 1,271.34 × 628.74
  4. Step 4: Simplify right side
    847.98x = 799,342.31
  5. Step 5: Solve for x
    x = 799,342.31/847.98
  6. Step 6: Final answer
    x = 942.64

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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.