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Finding the Fourth Proportional to 623.76, 860.80 and 343.98

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Solution

The fourth proportional to 623.76, 860.80 and 343.98 is: 474.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.76 : 860.80 = 343.98 : x
  2. Step 2: Convert to fraction form
    623.76/860.80 = 343.98/x
  3. Step 3: Cross multiply
    623.76x = 860.80 × 343.98
  4. Step 4: Simplify right side
    623.76x = 296,097.98
  5. Step 5: Solve for x
    x = 296,097.98/623.76
  6. Step 6: Final answer
    x = 474.70

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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.