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Finding the Fourth Proportional to 623.04, 859.31 and 386.86

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Solution

The fourth proportional to 623.04, 859.31 and 386.86 is: 533.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.04 : 859.31 = 386.86 : x
  2. Step 2: Convert to fraction form
    623.04/859.31 = 386.86/x
  3. Step 3: Cross multiply
    623.04x = 859.31 × 386.86
  4. Step 4: Simplify right side
    623.04x = 332,429.55
  5. Step 5: Solve for x
    x = 332,429.55/623.04
  6. Step 6: Final answer
    x = 533.56

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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.