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Finding the Fourth Proportional to 623.07, 859.75 and 390.20

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Solution

The fourth proportional to 623.07, 859.75 and 390.20 is: 538.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.07 : 859.75 = 390.20 : x
  2. Step 2: Convert to fraction form
    623.07/859.75 = 390.20/x
  3. Step 3: Cross multiply
    623.07x = 859.75 × 390.20
  4. Step 4: Simplify right side
    623.07x = 335,469.18
  5. Step 5: Solve for x
    x = 335,469.18/623.07
  6. Step 6: Final answer
    x = 538.41

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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.