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Finding the Fourth Proportional to 818.57, 1,129.63 and 487.00

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Solution

The fourth proportional to 818.57, 1,129.63 and 487.00 is: 672.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.57 : 1,129.63 = 487.00 : x
  2. Step 2: Convert to fraction form
    818.57/1,129.63 = 487.00/x
  3. Step 3: Cross multiply
    818.57x = 1,129.63 × 487.00
  4. Step 4: Simplify right side
    818.57x = 550,128.51
  5. Step 5: Solve for x
    x = 550,128.51/818.57
  6. Step 6: Final answer
    x = 672.06

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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.