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Finding the Fourth Proportional to 917.96, 1,377.14 and 268.74

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Solution

The fourth proportional to 917.96, 1,377.14 and 268.74 is: 403.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.96 : 1,377.14 = 268.74 : x
  2. Step 2: Convert to fraction form
    917.96/1,377.14 = 268.74/x
  3. Step 3: Cross multiply
    917.96x = 1,377.14 × 268.74
  4. Step 4: Simplify right side
    917.96x = 370,091.26
  5. Step 5: Solve for x
    x = 370,091.26/917.96
  6. Step 6: Final answer
    x = 403.17

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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.