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Finding the Fourth Proportional to 421.01, 630.08 and 384.49

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Solution

The fourth proportional to 421.01, 630.08 and 384.49 is: 575.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.01 : 630.08 = 384.49 : x
  2. Step 2: Convert to fraction form
    421.01/630.08 = 384.49/x
  3. Step 3: Cross multiply
    421.01x = 630.08 × 384.49
  4. Step 4: Simplify right side
    421.01x = 242,259.77
  5. Step 5: Solve for x
    x = 242,259.77/421.01
  6. Step 6: Final answer
    x = 575.43

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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.