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Finding the Fourth Proportional to 447.37, 670.40 and 398.72

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Solution

The fourth proportional to 447.37, 670.40 and 398.72 is: 597.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.37 : 670.40 = 398.72 : x
  2. Step 2: Convert to fraction form
    447.37/670.40 = 398.72/x
  3. Step 3: Cross multiply
    447.37x = 670.40 × 398.72
  4. Step 4: Simplify right side
    447.37x = 267,301.89
  5. Step 5: Solve for x
    x = 267,301.89/447.37
  6. Step 6: Final answer
    x = 597.50

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.