Home / 1,129.45-1,558.58-631.99

Finding the Fourth Proportional to 1,129.45, 1,558.58 and 631.99

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Solution

The fourth proportional to 1,129.45, 1,558.58 and 631.99 is: 872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.45 : 1,558.58 = 631.99 : x
  2. Step 2: Convert to fraction form
    1,129.45/1,558.58 = 631.99/x
  3. Step 3: Cross multiply
    1,129.45x = 1,558.58 × 631.99
  4. Step 4: Simplify right side
    1,129.45x = 985,006.97
  5. Step 5: Solve for x
    x = 985,006.97/1,129.45
  6. Step 6: Final answer
    x = 872.11

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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.