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Finding the Fourth Proportional to 1,012.71, 1,515.60 and 642.33

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Solution

The fourth proportional to 1,012.71, 1,515.60 and 642.33 is: 961.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.71 : 1,515.60 = 642.33 : x
  2. Step 2: Convert to fraction form
    1,012.71/1,515.60 = 642.33/x
  3. Step 3: Cross multiply
    1,012.71x = 1,515.60 × 642.33
  4. Step 4: Simplify right side
    1,012.71x = 973,515.35
  5. Step 5: Solve for x
    x = 973,515.35/1,012.71
  6. Step 6: Final answer
    x = 961.30

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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.