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Finding the Fourth Proportional to 630.40, 945.48 and 191.64

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Solution

The fourth proportional to 630.40, 945.48 and 191.64 is: 287.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.40 : 945.48 = 191.64 : x
  2. Step 2: Convert to fraction form
    630.40/945.48 = 191.64/x
  3. Step 3: Cross multiply
    630.40x = 945.48 × 191.64
  4. Step 4: Simplify right side
    630.40x = 181,191.79
  5. Step 5: Solve for x
    x = 181,191.79/630.40
  6. Step 6: Final answer
    x = 287.42

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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.