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Finding the Fourth Proportional to 904.11, 1,355.45 and 390.75

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Solution

The fourth proportional to 904.11, 1,355.45 and 390.75 is: 585.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.11 : 1,355.45 = 390.75 : x
  2. Step 2: Convert to fraction form
    904.11/1,355.45 = 390.75/x
  3. Step 3: Cross multiply
    904.11x = 1,355.45 × 390.75
  4. Step 4: Simplify right side
    904.11x = 529,640.13
  5. Step 5: Solve for x
    x = 529,640.13/904.11
  6. Step 6: Final answer
    x = 585.81

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Double scale
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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.