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Finding the Fourth Proportional to 989.70, 1,483.35 and 441.30

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Solution

The fourth proportional to 989.70, 1,483.35 and 441.30 is: 661.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.70 : 1,483.35 = 441.30 : x
  2. Step 2: Convert to fraction form
    989.70/1,483.35 = 441.30/x
  3. Step 3: Cross multiply
    989.70x = 1,483.35 × 441.30
  4. Step 4: Simplify right side
    989.70x = 654,602.36
  5. Step 5: Solve for x
    x = 654,602.36/989.70
  6. Step 6: Final answer
    x = 661.41

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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.