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Finding the Fourth Proportional to 818.37, 1,129.38 and 487.05

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Solution

The fourth proportional to 818.37, 1,129.38 and 487.05 is: 672.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.37 : 1,129.38 = 487.05 : x
  2. Step 2: Convert to fraction form
    818.37/1,129.38 = 487.05/x
  3. Step 3: Cross multiply
    818.37x = 1,129.38 × 487.05
  4. Step 4: Simplify right side
    818.37x = 550,064.53
  5. Step 5: Solve for x
    x = 550,064.53/818.37
  6. Step 6: Final answer
    x = 672.15

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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.