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Finding the Fourth Proportional to 623.18, 859.66 and 387.06

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Solution

The fourth proportional to 623.18, 859.66 and 387.06 is: 533.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.18 : 859.66 = 387.06 : x
  2. Step 2: Convert to fraction form
    623.18/859.66 = 387.06/x
  3. Step 3: Cross multiply
    623.18x = 859.66 × 387.06
  4. Step 4: Simplify right side
    623.18x = 332,739.03
  5. Step 5: Solve for x
    x = 332,739.03/623.18
  6. Step 6: Final answer
    x = 533.94

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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.