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Finding the Fourth Proportional to 1,010.21, 1,515.32 and 316.85

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Solution

The fourth proportional to 1,010.21, 1,515.32 and 316.85 is: 475.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.21 : 1,515.32 = 316.85 : x
  2. Step 2: Convert to fraction form
    1,010.21/1,515.32 = 316.85/x
  3. Step 3: Cross multiply
    1,010.21x = 1,515.32 × 316.85
  4. Step 4: Simplify right side
    1,010.21x = 480,119.98
  5. Step 5: Solve for x
    x = 480,119.98/1,010.21
  6. Step 6: Final answer
    x = 475.27

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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.