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Finding the Fourth Proportional to 670.42, 925.20 and 375.70

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Solution

The fourth proportional to 670.42, 925.20 and 375.70 is: 518.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.42 : 925.20 = 375.70 : x
  2. Step 2: Convert to fraction form
    670.42/925.20 = 375.70/x
  3. Step 3: Cross multiply
    670.42x = 925.20 × 375.70
  4. Step 4: Simplify right side
    670.42x = 347,597.64
  5. Step 5: Solve for x
    x = 347,597.64/670.42
  6. Step 6: Final answer
    x = 518.48

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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.