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Finding the Fourth Proportional to 1,010.12, 1,515.78 and 645.03

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Solution

The fourth proportional to 1,010.12, 1,515.78 and 645.03 is: 967.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.12 : 1,515.78 = 645.03 : x
  2. Step 2: Convert to fraction form
    1,010.12/1,515.78 = 645.03/x
  3. Step 3: Cross multiply
    1,010.12x = 1,515.78 × 645.03
  4. Step 4: Simplify right side
    1,010.12x = 977,723.57
  5. Step 5: Solve for x
    x = 977,723.57/1,010.12
  6. Step 6: Final answer
    x = 967.93

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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.