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Finding the Fourth Proportional to 668.12, 920.76 and 458.36

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Solution

The fourth proportional to 668.12, 920.76 and 458.36 is: 631.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.12 : 920.76 = 458.36 : x
  2. Step 2: Convert to fraction form
    668.12/920.76 = 458.36/x
  3. Step 3: Cross multiply
    668.12x = 920.76 × 458.36
  4. Step 4: Simplify right side
    668.12x = 422,039.55
  5. Step 5: Solve for x
    x = 422,039.55/668.12
  6. Step 6: Final answer
    x = 631.68

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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.