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Finding the Fourth Proportional to 851.76, 1,175.04 and 612.72

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Solution

The fourth proportional to 851.76, 1,175.04 and 612.72 is: 845.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.76 : 1,175.04 = 612.72 : x
  2. Step 2: Convert to fraction form
    851.76/1,175.04 = 612.72/x
  3. Step 3: Cross multiply
    851.76x = 1,175.04 × 612.72
  4. Step 4: Simplify right side
    851.76x = 719,970.51
  5. Step 5: Solve for x
    x = 719,970.51/851.76
  6. Step 6: Final answer
    x = 845.27

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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.