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Finding the Fourth Proportional to 989.38, 1,485.04 and 874.56

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Solution

The fourth proportional to 989.38, 1,485.04 and 874.56 is: 1,312.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.38 : 1,485.04 = 874.56 : x
  2. Step 2: Convert to fraction form
    989.38/1,485.04 = 874.56/x
  3. Step 3: Cross multiply
    989.38x = 1,485.04 × 874.56
  4. Step 4: Simplify right side
    989.38x = 1,298,756.58
  5. Step 5: Solve for x
    x = 1,298,756.58/989.38
  6. Step 6: Final answer
    x = 1,312.70

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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.