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Finding the Fourth Proportional to 997.84, 1,495.92 and 780.72

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Solution

The fourth proportional to 997.84, 1,495.92 and 780.72 is: 1,170.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.84 : 1,495.92 = 780.72 : x
  2. Step 2: Convert to fraction form
    997.84/1,495.92 = 780.72/x
  3. Step 3: Cross multiply
    997.84x = 1,495.92 × 780.72
  4. Step 4: Simplify right side
    997.84x = 1,167,894.66
  5. Step 5: Solve for x
    x = 1,167,894.66/997.84
  6. Step 6: Final answer
    x = 1,170.42

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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.