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Finding the Fourth Proportional to 900.72, 1,242.36 and 620.52

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Solution

The fourth proportional to 900.72, 1,242.36 and 620.52 is: 855.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.72 : 1,242.36 = 620.52 : x
  2. Step 2: Convert to fraction form
    900.72/1,242.36 = 620.52/x
  3. Step 3: Cross multiply
    900.72x = 1,242.36 × 620.52
  4. Step 4: Simplify right side
    900.72x = 770,909.23
  5. Step 5: Solve for x
    x = 770,909.23/900.72
  6. Step 6: Final answer
    x = 855.88

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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.