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Finding the Fourth Proportional to 673.47, 929.39 and 378.80

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Solution

The fourth proportional to 673.47, 929.39 and 378.80 is: 522.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.47 : 929.39 = 378.80 : x
  2. Step 2: Convert to fraction form
    673.47/929.39 = 378.80/x
  3. Step 3: Cross multiply
    673.47x = 929.39 × 378.80
  4. Step 4: Simplify right side
    673.47x = 352,048.34
  5. Step 5: Solve for x
    x = 352,048.34/673.47
  6. Step 6: Final answer
    x = 522.74

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1.5x scale

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.