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Finding the Fourth Proportional to 673.78, 929.40 and 440.90

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Solution

The fourth proportional to 673.78, 929.40 and 440.90 is: 608.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.78 : 929.40 = 440.90 : x
  2. Step 2: Convert to fraction form
    673.78/929.40 = 440.90/x
  3. Step 3: Cross multiply
    673.78x = 929.40 × 440.90
  4. Step 4: Simplify right side
    673.78x = 409,772.46
  5. Step 5: Solve for x
    x = 409,772.46/673.78
  6. Step 6: Final answer
    x = 608.17

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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.