Home / 1,129.50-1,558.61-631.98

Finding the Fourth Proportional to 1,129.50, 1,558.61 and 631.98

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Solution

The fourth proportional to 1,129.50, 1,558.61 and 631.98 is: 872.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.50 : 1,558.61 = 631.98 : x
  2. Step 2: Convert to fraction form
    1,129.50/1,558.61 = 631.98/x
  3. Step 3: Cross multiply
    1,129.50x = 1,558.61 × 631.98
  4. Step 4: Simplify right side
    1,129.50x = 985,010.35
  5. Step 5: Solve for x
    x = 985,010.35/1,129.50
  6. Step 6: Final answer
    x = 872.08

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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.