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Finding the Fourth Proportional to 818.29, 1,129.35 and 469

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Solution

The fourth proportional to 818.29, 1,129.35 and 469 is: 647.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.29 : 1,129.35 = 469 : x
  2. Step 2: Convert to fraction form
    818.29/1,129.35 = 469/x
  3. Step 3: Cross multiply
    818.29x = 1,129.35 × 469
  4. Step 4: Simplify right side
    818.29x = 529,665.15
  5. Step 5: Solve for x
    x = 529,665.15/818.29
  6. Step 6: Final answer
    x = 647.28

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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.