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Finding the Fourth Proportional to 646.99, 892.42 and 384.75

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Solution

The fourth proportional to 646.99, 892.42 and 384.75 is: 530.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.99 : 892.42 = 384.75 : x
  2. Step 2: Convert to fraction form
    646.99/892.42 = 384.75/x
  3. Step 3: Cross multiply
    646.99x = 892.42 × 384.75
  4. Step 4: Simplify right side
    646.99x = 343,357.63
  5. Step 5: Solve for x
    x = 343,357.63/646.99
  6. Step 6: Final answer
    x = 530.70

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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.