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Finding the Fourth Proportional to 1,045.80, 1,438.95 and 905.49

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Solution

The fourth proportional to 1,045.80, 1,438.95 and 905.49 is: 1,245.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.80 : 1,438.95 = 905.49 : x
  2. Step 2: Convert to fraction form
    1,045.80/1,438.95 = 905.49/x
  3. Step 3: Cross multiply
    1,045.80x = 1,438.95 × 905.49
  4. Step 4: Simplify right side
    1,045.80x = 1,302,954.84
  5. Step 5: Solve for x
    x = 1,302,954.84/1,045.80
  6. Step 6: Final answer
    x = 1,245.89

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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.