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Finding the Fourth Proportional to 1,012.64, 1,511.56 and 869.28

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Solution

The fourth proportional to 1,012.64, 1,511.56 and 869.28 is: 1,297.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.64 : 1,511.56 = 869.28 : x
  2. Step 2: Convert to fraction form
    1,012.64/1,511.56 = 869.28/x
  3. Step 3: Cross multiply
    1,012.64x = 1,511.56 × 869.28
  4. Step 4: Simplify right side
    1,012.64x = 1,313,968.88
  5. Step 5: Solve for x
    x = 1,313,968.88/1,012.64
  6. Step 6: Final answer
    x = 1,297.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.