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Finding the Fourth Proportional to 997.19, 1,495.78 and 313.19

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Solution

The fourth proportional to 997.19, 1,495.78 and 313.19 is: 469.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.19 : 1,495.78 = 313.19 : x
  2. Step 2: Convert to fraction form
    997.19/1,495.78 = 313.19/x
  3. Step 3: Cross multiply
    997.19x = 1,495.78 × 313.19
  4. Step 4: Simplify right side
    997.19x = 468,463.34
  5. Step 5: Solve for x
    x = 468,463.34/997.19
  6. Step 6: Final answer
    x = 469.78

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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.