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Finding the Fourth Proportional to 523.42, 785.51 and 421.93

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Solution

The fourth proportional to 523.42, 785.51 and 421.93 is: 633.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.42 : 785.51 = 421.93 : x
  2. Step 2: Convert to fraction form
    523.42/785.51 = 421.93/x
  3. Step 3: Cross multiply
    523.42x = 785.51 × 421.93
  4. Step 4: Simplify right side
    523.42x = 331,428.12
  5. Step 5: Solve for x
    x = 331,428.12/523.42
  6. Step 6: Final answer
    x = 633.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.