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Finding the Fourth Proportional to 818.37, 1,129.50 and 631.44

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Solution

The fourth proportional to 818.37, 1,129.50 and 631.44 is: 871.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.37 : 1,129.50 = 631.44 : x
  2. Step 2: Convert to fraction form
    818.37/1,129.50 = 631.44/x
  3. Step 3: Cross multiply
    818.37x = 1,129.50 × 631.44
  4. Step 4: Simplify right side
    818.37x = 713,211.48
  5. Step 5: Solve for x
    x = 713,211.48/818.37
  6. Step 6: Final answer
    x = 871.50

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1.5x scale

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.