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Finding the Fourth Proportional to 898, 1,240 and 712.46

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Solution

The fourth proportional to 898, 1,240 and 712.46 is: 983.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    898 : 1,240 = 712.46 : x
  2. Step 2: Convert to fraction form
    898/1,240 = 712.46/x
  3. Step 3: Cross multiply
    898x = 1,240 × 712.46
  4. Step 4: Simplify right side
    898x = 883,450.40
  5. Step 5: Solve for x
    x = 883,450.40/898
  6. Step 6: Final answer
    x = 983.80

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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.