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Finding the Fourth Proportional to 623, 859.74 and 390.12

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Solution

The fourth proportional to 623, 859.74 and 390.12 is: 538.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    623 : 859.74 = 390.12 : x
  2. Step 2: Convert to fraction form
    623/859.74 = 390.12/x
  3. Step 3: Cross multiply
    623x = 859.74 × 390.12
  4. Step 4: Simplify right side
    623x = 335,401.77
  5. Step 5: Solve for x
    x = 335,401.77/623
  6. Step 6: Final answer
    x = 538.37

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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.