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Finding the Fourth Proportional to 623.34, 860.04 and 390.42

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Solution

The fourth proportional to 623.34, 860.04 and 390.42 is: 538.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.34 : 860.04 = 390.42 : x
  2. Step 2: Convert to fraction form
    623.34/860.04 = 390.42/x
  3. Step 3: Cross multiply
    623.34x = 860.04 × 390.42
  4. Step 4: Simplify right side
    623.34x = 335,776.82
  5. Step 5: Solve for x
    x = 335,776.82/623.34
  6. Step 6: Final answer
    x = 538.67

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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.