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Finding the Fourth Proportional to 448.17, 671.07 and 420.79

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Solution

The fourth proportional to 448.17, 671.07 and 420.79 is: 630.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.17 : 671.07 = 420.79 : x
  2. Step 2: Convert to fraction form
    448.17/671.07 = 420.79/x
  3. Step 3: Cross multiply
    448.17x = 671.07 × 420.79
  4. Step 4: Simplify right side
    448.17x = 282,379.45
  5. Step 5: Solve for x
    x = 282,379.45/448.17
  6. Step 6: Final answer
    x = 630.07

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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.