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Finding the Fourth Proportional to 703.71, 971.15 and 388.98

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Solution

The fourth proportional to 703.71, 971.15 and 388.98 is: 536.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.71 : 971.15 = 388.98 : x
  2. Step 2: Convert to fraction form
    703.71/971.15 = 388.98/x
  3. Step 3: Cross multiply
    703.71x = 971.15 × 388.98
  4. Step 4: Simplify right side
    703.71x = 377,755.99
  5. Step 5: Solve for x
    x = 377,755.99/703.71
  6. Step 6: Final answer
    x = 536.80

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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.