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Finding the Fourth Proportional to 902.22, 1,245.12 and 509.31

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Solution

The fourth proportional to 902.22, 1,245.12 and 509.31 is: 702.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.22 : 1,245.12 = 509.31 : x
  2. Step 2: Convert to fraction form
    902.22/1,245.12 = 509.31/x
  3. Step 3: Cross multiply
    902.22x = 1,245.12 × 509.31
  4. Step 4: Simplify right side
    902.22x = 634,152.07
  5. Step 5: Solve for x
    x = 634,152.07/902.22
  6. Step 6: Final answer
    x = 702.88

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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.