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Finding the Fourth Proportional to 989.17, 1,485.81 and 785.16

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Solution

The fourth proportional to 989.17, 1,485.81 and 785.16 is: 1,179.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.17 : 1,485.81 = 785.16 : x
  2. Step 2: Convert to fraction form
    989.17/1,485.81 = 785.16/x
  3. Step 3: Cross multiply
    989.17x = 1,485.81 × 785.16
  4. Step 4: Simplify right side
    989.17x = 1,166,598.58
  5. Step 5: Solve for x
    x = 1,166,598.58/989.17
  6. Step 6: Final answer
    x = 1,179.37

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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.