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Finding the Fourth Proportional to 989.43, 1,485.50 and 637.08

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Solution

The fourth proportional to 989.43, 1,485.50 and 637.08 is: 956.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.43 : 1,485.50 = 637.08 : x
  2. Step 2: Convert to fraction form
    989.43/1,485.50 = 637.08/x
  3. Step 3: Cross multiply
    989.43x = 1,485.50 × 637.08
  4. Step 4: Simplify right side
    989.43x = 946,382.34
  5. Step 5: Solve for x
    x = 946,382.34/989.43
  6. Step 6: Final answer
    x = 956.49

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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.