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Finding the Fourth Proportional to 673.56, 929.28 and 393.70

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Solution

The fourth proportional to 673.56, 929.28 and 393.70 is: 543.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.56 : 929.28 = 393.70 : x
  2. Step 2: Convert to fraction form
    673.56/929.28 = 393.70/x
  3. Step 3: Cross multiply
    673.56x = 929.28 × 393.70
  4. Step 4: Simplify right side
    673.56x = 365,853.74
  5. Step 5: Solve for x
    x = 365,853.74/673.56
  6. Step 6: Final answer
    x = 543.16

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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.