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Finding the Fourth Proportional to 997.45, 1,490.36 and 877.17

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Solution

The fourth proportional to 997.45, 1,490.36 and 877.17 is: 1,310.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.45 : 1,490.36 = 877.17 : x
  2. Step 2: Convert to fraction form
    997.45/1,490.36 = 877.17/x
  3. Step 3: Cross multiply
    997.45x = 1,490.36 × 877.17
  4. Step 4: Simplify right side
    997.45x = 1,307,299.08
  5. Step 5: Solve for x
    x = 1,307,299.08/997.45
  6. Step 6: Final answer
    x = 1,310.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.