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Finding the Fourth Proportional to 989.96, 1,484.31 and 340.57

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Solution

The fourth proportional to 989.96, 1,484.31 and 340.57 is: 510.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.96 : 1,484.31 = 340.57 : x
  2. Step 2: Convert to fraction form
    989.96/1,484.31 = 340.57/x
  3. Step 3: Cross multiply
    989.96x = 1,484.31 × 340.57
  4. Step 4: Simplify right side
    989.96x = 505,504.04
  5. Step 5: Solve for x
    x = 505,504.04/989.96
  6. Step 6: Final answer
    x = 510.63

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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.