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Finding the Fourth Proportional to 735.81, 1,015.51 and 421.12

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Solution

The fourth proportional to 735.81, 1,015.51 and 421.12 is: 581.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    735.81 : 1,015.51 = 421.12 : x
  2. Step 2: Convert to fraction form
    735.81/1,015.51 = 421.12/x
  3. Step 3: Cross multiply
    735.81x = 1,015.51 × 421.12
  4. Step 4: Simplify right side
    735.81x = 427,656.62
  5. Step 5: Solve for x
    x = 427,656.62/735.81
  6. Step 6: Final answer
    x = 581.21

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1.5x scale

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.