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Finding the Fourth Proportional to 617.84, 851.45 and 421.01

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Solution

The fourth proportional to 617.84, 851.45 and 421.01 is: 580.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.84 : 851.45 = 421.01 : x
  2. Step 2: Convert to fraction form
    617.84/851.45 = 421.01/x
  3. Step 3: Cross multiply
    617.84x = 851.45 × 421.01
  4. Step 4: Simplify right side
    617.84x = 358,472.15
  5. Step 5: Solve for x
    x = 358,472.15/617.84
  6. Step 6: Final answer
    x = 580.20

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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.