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Finding the Fourth Proportional to 920.49, 1,267.56 and 900.06

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Solution

The fourth proportional to 920.49, 1,267.56 and 900.06 is: 1,239.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.49 : 1,267.56 = 900.06 : x
  2. Step 2: Convert to fraction form
    920.49/1,267.56 = 900.06/x
  3. Step 3: Cross multiply
    920.49x = 1,267.56 × 900.06
  4. Step 4: Simplify right side
    920.49x = 1,140,880.05
  5. Step 5: Solve for x
    x = 1,140,880.05/920.49
  6. Step 6: Final answer
    x = 1,239.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.