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Finding the Fourth Proportional to 804.72, 1,110.60 and 455.40

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Solution

The fourth proportional to 804.72, 1,110.60 and 455.40 is: 628.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.72 : 1,110.60 = 455.40 : x
  2. Step 2: Convert to fraction form
    804.72/1,110.60 = 455.40/x
  3. Step 3: Cross multiply
    804.72x = 1,110.60 × 455.40
  4. Step 4: Simplify right side
    804.72x = 505,767.24
  5. Step 5: Solve for x
    x = 505,767.24/804.72
  6. Step 6: Final answer
    x = 628.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.