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Finding the Fourth Proportional to 989.52, 1,485.11 and 340.71

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Solution

The fourth proportional to 989.52, 1,485.11 and 340.71 is: 511.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.52 : 1,485.11 = 340.71 : x
  2. Step 2: Convert to fraction form
    989.52/1,485.11 = 340.71/x
  3. Step 3: Cross multiply
    989.52x = 1,485.11 × 340.71
  4. Step 4: Simplify right side
    989.52x = 505,990.12
  5. Step 5: Solve for x
    x = 505,990.12/989.52
  6. Step 6: Final answer
    x = 511.35

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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.