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Finding the Fourth Proportional to 623.07, 859.47 and 389.79

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Solution

The fourth proportional to 623.07, 859.47 and 389.79 is: 537.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.07 : 859.47 = 389.79 : x
  2. Step 2: Convert to fraction form
    623.07/859.47 = 389.79/x
  3. Step 3: Cross multiply
    623.07x = 859.47 × 389.79
  4. Step 4: Simplify right side
    623.07x = 335,008.51
  5. Step 5: Solve for x
    x = 335,008.51/623.07
  6. Step 6: Final answer
    x = 537.68

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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.