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Finding the Fourth Proportional to 647.84, 971.76 and 404.64

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Solution

The fourth proportional to 647.84, 971.76 and 404.64 is: 606.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.84 : 971.76 = 404.64 : x
  2. Step 2: Convert to fraction form
    647.84/971.76 = 404.64/x
  3. Step 3: Cross multiply
    647.84x = 971.76 × 404.64
  4. Step 4: Simplify right side
    647.84x = 393,212.97
  5. Step 5: Solve for x
    x = 393,212.97/647.84
  6. Step 6: Final answer
    x = 606.96

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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.