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Finding the Fourth Proportional to 917.64, 1,374.14 and 608.54

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Solution

The fourth proportional to 917.64, 1,374.14 and 608.54 is: 911.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.64 : 1,374.14 = 608.54 : x
  2. Step 2: Convert to fraction form
    917.64/1,374.14 = 608.54/x
  3. Step 3: Cross multiply
    917.64x = 1,374.14 × 608.54
  4. Step 4: Simplify right side
    917.64x = 836,219.16
  5. Step 5: Solve for x
    x = 836,219.16/917.64
  6. Step 6: Final answer
    x = 911.27

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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.