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Finding the Fourth Proportional to 647.87, 894.41 and 439.16

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Solution

The fourth proportional to 647.87, 894.41 and 439.16 is: 606.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.87 : 894.41 = 439.16 : x
  2. Step 2: Convert to fraction form
    647.87/894.41 = 439.16/x
  3. Step 3: Cross multiply
    647.87x = 894.41 × 439.16
  4. Step 4: Simplify right side
    647.87x = 392,784.07
  5. Step 5: Solve for x
    x = 392,784.07/647.87
  6. Step 6: Final answer
    x = 606.27

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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.