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Finding the Fourth Proportional to 485.62, 671.06 and 420.01

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Solution

The fourth proportional to 485.62, 671.06 and 420.01 is: 580.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.62 : 671.06 = 420.01 : x
  2. Step 2: Convert to fraction form
    485.62/671.06 = 420.01/x
  3. Step 3: Cross multiply
    485.62x = 671.06 × 420.01
  4. Step 4: Simplify right side
    485.62x = 281,851.91
  5. Step 5: Solve for x
    x = 281,851.91/485.62
  6. Step 6: Final answer
    x = 580.40

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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.