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Finding the Fourth Proportional to 917.49, 1,376.71 and 455.26

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Solution

The fourth proportional to 917.49, 1,376.71 and 455.26 is: 683.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.49 : 1,376.71 = 455.26 : x
  2. Step 2: Convert to fraction form
    917.49/1,376.71 = 455.26/x
  3. Step 3: Cross multiply
    917.49x = 1,376.71 × 455.26
  4. Step 4: Simplify right side
    917.49x = 626,765.43
  5. Step 5: Solve for x
    x = 626,765.43/917.49
  6. Step 6: Final answer
    x = 683.13

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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.