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Finding the Fourth Proportional to 617.58, 852.60 and 421.38

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Solution

The fourth proportional to 617.58, 852.60 and 421.38 is: 581.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.58 : 852.60 = 421.38 : x
  2. Step 2: Convert to fraction form
    617.58/852.60 = 421.38/x
  3. Step 3: Cross multiply
    617.58x = 852.60 × 421.38
  4. Step 4: Simplify right side
    617.58x = 359,268.59
  5. Step 5: Solve for x
    x = 359,268.59/617.58
  6. Step 6: Final answer
    x = 581.74

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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.