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Finding the Fourth Proportional to 989.05, 1,483.74 and 372.81

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Solution

The fourth proportional to 989.05, 1,483.74 and 372.81 is: 559.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.05 : 1,483.74 = 372.81 : x
  2. Step 2: Convert to fraction form
    989.05/1,483.74 = 372.81/x
  3. Step 3: Cross multiply
    989.05x = 1,483.74 × 372.81
  4. Step 4: Simplify right side
    989.05x = 553,143.83
  5. Step 5: Solve for x
    x = 553,143.83/989.05
  6. Step 6: Final answer
    x = 559.27

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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.