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Finding the Fourth Proportional to 623.72, 859.59 and 499.79

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Solution

The fourth proportional to 623.72, 859.59 and 499.79 is: 688.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.72 : 859.59 = 499.79 : x
  2. Step 2: Convert to fraction form
    623.72/859.59 = 499.79/x
  3. Step 3: Cross multiply
    623.72x = 859.59 × 499.79
  4. Step 4: Simplify right side
    623.72x = 429,610.19
  5. Step 5: Solve for x
    x = 429,610.19/623.72
  6. Step 6: Final answer
    x = 688.79

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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.