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Finding the Fourth Proportional to 874.60, 1,311.90 and 628.12

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Solution

The fourth proportional to 874.60, 1,311.90 and 628.12 is: 942.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.60 : 1,311.90 = 628.12 : x
  2. Step 2: Convert to fraction form
    874.60/1,311.90 = 628.12/x
  3. Step 3: Cross multiply
    874.60x = 1,311.90 × 628.12
  4. Step 4: Simplify right side
    874.60x = 824,030.63
  5. Step 5: Solve for x
    x = 824,030.63/874.60
  6. Step 6: Final answer
    x = 942.18

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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.