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Finding the Fourth Proportional to 865.34, 1,297.08 and 425.98

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Solution

The fourth proportional to 865.34, 1,297.08 and 425.98 is: 638.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.34 : 1,297.08 = 425.98 : x
  2. Step 2: Convert to fraction form
    865.34/1,297.08 = 425.98/x
  3. Step 3: Cross multiply
    865.34x = 1,297.08 × 425.98
  4. Step 4: Simplify right side
    865.34x = 552,530.14
  5. Step 5: Solve for x
    x = 552,530.14/865.34
  6. Step 6: Final answer
    x = 638.51

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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.