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Finding the Fourth Proportional to 851.76, 1,175.44 and 478.72

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Solution

The fourth proportional to 851.76, 1,175.44 and 478.72 is: 660.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.76 : 1,175.44 = 478.72 : x
  2. Step 2: Convert to fraction form
    851.76/1,175.44 = 478.72/x
  3. Step 3: Cross multiply
    851.76x = 1,175.44 × 478.72
  4. Step 4: Simplify right side
    851.76x = 562,698.96
  5. Step 5: Solve for x
    x = 562,698.96/851.76
  6. Step 6: Final answer
    x = 660.63

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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.