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Finding the Fourth Proportional to 735.63, 1,015.20 and 420.87

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Solution

The fourth proportional to 735.63, 1,015.20 and 420.87 is: 580.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    735.63 : 1,015.20 = 420.87 : x
  2. Step 2: Convert to fraction form
    735.63/1,015.20 = 420.87/x
  3. Step 3: Cross multiply
    735.63x = 1,015.20 × 420.87
  4. Step 4: Simplify right side
    735.63x = 427,265.12
  5. Step 5: Solve for x
    x = 427,265.12/735.63
  6. Step 6: Final answer
    x = 580.81

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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.