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Finding the Fourth Proportional to 1,129.45, 1,558.81 and 650.81

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Solution

The fourth proportional to 1,129.45, 1,558.81 and 650.81 is: 898.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.45 : 1,558.81 = 650.81 : x
  2. Step 2: Convert to fraction form
    1,129.45/1,558.81 = 650.81/x
  3. Step 3: Cross multiply
    1,129.45x = 1,558.81 × 650.81
  4. Step 4: Simplify right side
    1,129.45x = 1,014,490.80
  5. Step 5: Solve for x
    x = 1,014,490.80/1,129.45
  6. Step 6: Final answer
    x = 898.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.