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Finding the Fourth Proportional to 818.57, 1,129.57 and 487.02

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Solution

The fourth proportional to 818.57, 1,129.57 and 487.02 is: 672.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.57 : 1,129.57 = 487.02 : x
  2. Step 2: Convert to fraction form
    818.57/1,129.57 = 487.02/x
  3. Step 3: Cross multiply
    818.57x = 1,129.57 × 487.02
  4. Step 4: Simplify right side
    818.57x = 550,123.18
  5. Step 5: Solve for x
    x = 550,123.18/818.57
  6. Step 6: Final answer
    x = 672.05

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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.