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Finding the Fourth Proportional to 647.02, 892.80 and 381.40

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Solution

The fourth proportional to 647.02, 892.80 and 381.40 is: 526.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.02 : 892.80 = 381.40 : x
  2. Step 2: Convert to fraction form
    647.02/892.80 = 381.40/x
  3. Step 3: Cross multiply
    647.02x = 892.80 × 381.40
  4. Step 4: Simplify right side
    647.02x = 340,513.92
  5. Step 5: Solve for x
    x = 340,513.92/647.02
  6. Step 6: Final answer
    x = 526.28

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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.