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Finding the Fourth Proportional to 1,111.51, 1,667.28 and 289.73

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Solution

The fourth proportional to 1,111.51, 1,667.28 and 289.73 is: 434.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.51 : 1,667.28 = 289.73 : x
  2. Step 2: Convert to fraction form
    1,111.51/1,667.28 = 289.73/x
  3. Step 3: Cross multiply
    1,111.51x = 1,667.28 × 289.73
  4. Step 4: Simplify right side
    1,111.51x = 483,061.03
  5. Step 5: Solve for x
    x = 483,061.03/1,111.51
  6. Step 6: Final answer
    x = 434.60

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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.