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Finding the Fourth Proportional to 1,155.07, 1,732.59 and 289.39

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Solution

The fourth proportional to 1,155.07, 1,732.59 and 289.39 is: 434.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.07 : 1,732.59 = 289.39 : x
  2. Step 2: Convert to fraction form
    1,155.07/1,732.59 = 289.39/x
  3. Step 3: Cross multiply
    1,155.07x = 1,732.59 × 289.39
  4. Step 4: Simplify right side
    1,155.07x = 501,394.22
  5. Step 5: Solve for x
    x = 501,394.22/1,155.07
  6. Step 6: Final answer
    x = 434.08

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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.