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Finding the Fourth Proportional to 474.10, 709.80 and 420.10

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Solution

The fourth proportional to 474.10, 709.80 and 420.10 is: 628.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.10 : 709.80 = 420.10 : x
  2. Step 2: Convert to fraction form
    474.10/709.80 = 420.10/x
  3. Step 3: Cross multiply
    474.10x = 709.80 × 420.10
  4. Step 4: Simplify right side
    474.10x = 298,186.98
  5. Step 5: Solve for x
    x = 298,186.98/474.10
  6. Step 6: Final answer
    x = 628.95

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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.