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Finding the Fourth Proportional to 623.24, 860.58 and 390.44

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Solution

The fourth proportional to 623.24, 860.58 and 390.44 is: 539.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.24 : 860.58 = 390.44 : x
  2. Step 2: Convert to fraction form
    623.24/860.58 = 390.44/x
  3. Step 3: Cross multiply
    623.24x = 860.58 × 390.44
  4. Step 4: Simplify right side
    623.24x = 336,004.86
  5. Step 5: Solve for x
    x = 336,004.86/623.24
  6. Step 6: Final answer
    x = 539.13

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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.