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Finding the Fourth Proportional to 818.80, 1,129.96 and 469.50

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Solution

The fourth proportional to 818.80, 1,129.96 and 469.50 is: 647.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.80 : 1,129.96 = 469.50 : x
  2. Step 2: Convert to fraction form
    818.80/1,129.96 = 469.50/x
  3. Step 3: Cross multiply
    818.80x = 1,129.96 × 469.50
  4. Step 4: Simplify right side
    818.80x = 530,516.22
  5. Step 5: Solve for x
    x = 530,516.22/818.80
  6. Step 6: Final answer
    x = 647.92

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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.