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Finding the Fourth Proportional to 864.62, 1,297.69 and 345.64

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Solution

The fourth proportional to 864.62, 1,297.69 and 345.64 is: 518.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.62 : 1,297.69 = 345.64 : x
  2. Step 2: Convert to fraction form
    864.62/1,297.69 = 345.64/x
  3. Step 3: Cross multiply
    864.62x = 1,297.69 × 345.64
  4. Step 4: Simplify right side
    864.62x = 448,535.55
  5. Step 5: Solve for x
    x = 448,535.55/864.62
  6. Step 6: Final answer
    x = 518.77

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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.