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Finding the Fourth Proportional to 623.41, 860.34 and 402.55

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Solution

The fourth proportional to 623.41, 860.34 and 402.55 is: 555.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.41 : 860.34 = 402.55 : x
  2. Step 2: Convert to fraction form
    623.41/860.34 = 402.55/x
  3. Step 3: Cross multiply
    623.41x = 860.34 × 402.55
  4. Step 4: Simplify right side
    623.41x = 346,329.87
  5. Step 5: Solve for x
    x = 346,329.87/623.41
  6. Step 6: Final answer
    x = 555.54

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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.