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Finding the Fourth Proportional to 1,289.41, 1,780.01 and 917.17

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Solution

The fourth proportional to 1,289.41, 1,780.01 and 917.17 is: 1,266.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.41 : 1,780.01 = 917.17 : x
  2. Step 2: Convert to fraction form
    1,289.41/1,780.01 = 917.17/x
  3. Step 3: Cross multiply
    1,289.41x = 1,780.01 × 917.17
  4. Step 4: Simplify right side
    1,289.41x = 1,632,571.77
  5. Step 5: Solve for x
    x = 1,632,571.77/1,289.41
  6. Step 6: Final answer
    x = 1,266.14

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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.