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Finding the Fourth Proportional to 673.80, 929.97 and 643.02

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Solution

The fourth proportional to 673.80, 929.97 and 643.02 is: 887.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.80 : 929.97 = 643.02 : x
  2. Step 2: Convert to fraction form
    673.80/929.97 = 643.02/x
  3. Step 3: Cross multiply
    673.80x = 929.97 × 643.02
  4. Step 4: Simplify right side
    673.80x = 597,989.22
  5. Step 5: Solve for x
    x = 597,989.22/673.80
  6. Step 6: Final answer
    x = 887.48

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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.