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Finding the Fourth Proportional to 865.01, 1,297.65 and 287.75

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Solution

The fourth proportional to 865.01, 1,297.65 and 287.75 is: 431.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.01 : 1,297.65 = 287.75 : x
  2. Step 2: Convert to fraction form
    865.01/1,297.65 = 287.75/x
  3. Step 3: Cross multiply
    865.01x = 1,297.65 × 287.75
  4. Step 4: Simplify right side
    865.01x = 373,398.79
  5. Step 5: Solve for x
    x = 373,398.79/865.01
  6. Step 6: Final answer
    x = 431.67

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1.5x scale

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.