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Finding the Fourth Proportional to 917.89, 1,376.66 and 259.76

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Solution

The fourth proportional to 917.89, 1,376.66 and 259.76 is: 389.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.89 : 1,376.66 = 259.76 : x
  2. Step 2: Convert to fraction form
    917.89/1,376.66 = 259.76/x
  3. Step 3: Cross multiply
    917.89x = 1,376.66 × 259.76
  4. Step 4: Simplify right side
    917.89x = 357,604.81
  5. Step 5: Solve for x
    x = 357,604.81/917.89
  6. Step 6: Final answer
    x = 389.59

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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.