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Finding the Fourth Proportional to 621.64, 930.77 and 438.58

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Solution

The fourth proportional to 621.64, 930.77 and 438.58 is: 656.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.64 : 930.77 = 438.58 : x
  2. Step 2: Convert to fraction form
    621.64/930.77 = 438.58/x
  3. Step 3: Cross multiply
    621.64x = 930.77 × 438.58
  4. Step 4: Simplify right side
    621.64x = 408,210.26
  5. Step 5: Solve for x
    x = 408,210.26/621.64
  6. Step 6: Final answer
    x = 656.67

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