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Finding the Fourth Proportional to 623.75, 928.56 and 620.64

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Solution

The fourth proportional to 623.75, 928.56 and 620.64 is: 923.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.75 : 928.56 = 620.64 : x
  2. Step 2: Convert to fraction form
    623.75/928.56 = 620.64/x
  3. Step 3: Cross multiply
    623.75x = 928.56 × 620.64
  4. Step 4: Simplify right side
    623.75x = 576,301.19
  5. Step 5: Solve for x
    x = 576,301.19/623.75
  6. Step 6: Final answer
    x = 923.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.