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Finding the Fourth Proportional to 851.57, 1,175.19 and 478.55

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Solution

The fourth proportional to 851.57, 1,175.19 and 478.55 is: 660.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.57 : 1,175.19 = 478.55 : x
  2. Step 2: Convert to fraction form
    851.57/1,175.19 = 478.55/x
  3. Step 3: Cross multiply
    851.57x = 1,175.19 × 478.55
  4. Step 4: Simplify right side
    851.57x = 562,388.32
  5. Step 5: Solve for x
    x = 562,388.32/851.57
  6. Step 6: Final answer
    x = 660.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.