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Finding the Fourth Proportional to 523.76, 785.03 and 421.16

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Solution

The fourth proportional to 523.76, 785.03 and 421.16 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.76 : 785.03 = 421.16 : x
  2. Step 2: Convert to fraction form
    523.76/785.03 = 421.16/x
  3. Step 3: Cross multiply
    523.76x = 785.03 × 421.16
  4. Step 4: Simplify right side
    523.76x = 330,626.06
  5. Step 5: Solve for x
    x = 330,626.06/523.76
  6. Step 6: Final answer
    x = 631.25

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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.