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Finding the Fourth Proportional to 623.68, 860.80 and 361.76

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Solution

The fourth proportional to 623.68, 860.80 and 361.76 is: 499.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.68 : 860.80 = 361.76 : x
  2. Step 2: Convert to fraction form
    623.68/860.80 = 361.76/x
  3. Step 3: Cross multiply
    623.68x = 860.80 × 361.76
  4. Step 4: Simplify right side
    623.68x = 311,403.01
  5. Step 5: Solve for x
    x = 311,403.01/623.68
  6. Step 6: Final answer
    x = 499.30

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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.