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Finding the Fourth Proportional to 623.54, 859.74 and 498.80

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Solution

The fourth proportional to 623.54, 859.74 and 498.80 is: 687.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.54 : 859.74 = 498.80 : x
  2. Step 2: Convert to fraction form
    623.54/859.74 = 498.80/x
  3. Step 3: Cross multiply
    623.54x = 859.74 × 498.80
  4. Step 4: Simplify right side
    623.54x = 428,838.31
  5. Step 5: Solve for x
    x = 428,838.31/623.54
  6. Step 6: Final answer
    x = 687.75

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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.