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Finding the Fourth Proportional to 611.54, 917.64 and 403.30

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Solution

The fourth proportional to 611.54, 917.64 and 403.30 is: 605.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.54 : 917.64 = 403.30 : x
  2. Step 2: Convert to fraction form
    611.54/917.64 = 403.30/x
  3. Step 3: Cross multiply
    611.54x = 917.64 × 403.30
  4. Step 4: Simplify right side
    611.54x = 370,084.21
  5. Step 5: Solve for x
    x = 370,084.21/611.54
  6. Step 6: Final answer
    x = 605.17

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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.