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Finding the Fourth Proportional to 448.65, 619.21 and 420.86

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Solution

The fourth proportional to 448.65, 619.21 and 420.86 is: 580.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.65 : 619.21 = 420.86 : x
  2. Step 2: Convert to fraction form
    448.65/619.21 = 420.86/x
  3. Step 3: Cross multiply
    448.65x = 619.21 × 420.86
  4. Step 4: Simplify right side
    448.65x = 260,600.72
  5. Step 5: Solve for x
    x = 260,600.72/448.65
  6. Step 6: Final answer
    x = 580.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.