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Finding the Fourth Proportional to 673.60, 929.49 and 378.80

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Solution

The fourth proportional to 673.60, 929.49 and 378.80 is: 522.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.60 : 929.49 = 378.80 : x
  2. Step 2: Convert to fraction form
    673.60/929.49 = 378.80/x
  3. Step 3: Cross multiply
    673.60x = 929.49 × 378.80
  4. Step 4: Simplify right side
    673.60x = 352,090.81
  5. Step 5: Solve for x
    x = 352,090.81/673.60
  6. Step 6: Final answer
    x = 522.70

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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.