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Finding the Fourth Proportional to 637.40, 953.67 and 421.40

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Solution

The fourth proportional to 637.40, 953.67 and 421.40 is: 630.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.40 : 953.67 = 421.40 : x
  2. Step 2: Convert to fraction form
    637.40/953.67 = 421.40/x
  3. Step 3: Cross multiply
    637.40x = 953.67 × 421.40
  4. Step 4: Simplify right side
    637.40x = 401,876.54
  5. Step 5: Solve for x
    x = 401,876.54/637.40
  6. Step 6: Final answer
    x = 630.49

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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.