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Finding the Fourth Proportional to 647.78, 971.88 and 214.96

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Solution

The fourth proportional to 647.78, 971.88 and 214.96 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.78 : 971.88 = 214.96 : x
  2. Step 2: Convert to fraction form
    647.78/971.88 = 214.96/x
  3. Step 3: Cross multiply
    647.78x = 971.88 × 214.96
  4. Step 4: Simplify right side
    647.78x = 208,915.32
  5. Step 5: Solve for x
    x = 208,915.32/647.78
  6. Step 6: Final answer
    x = 322.51

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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.