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Finding the Fourth Proportional to 818.17, 1,129.21 and 468.86

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Solution

The fourth proportional to 818.17, 1,129.21 and 468.86 is: 647.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.17 : 1,129.21 = 468.86 : x
  2. Step 2: Convert to fraction form
    818.17/1,129.21 = 468.86/x
  3. Step 3: Cross multiply
    818.17x = 1,129.21 × 468.86
  4. Step 4: Simplify right side
    818.17x = 529,434.58
  5. Step 5: Solve for x
    x = 529,434.58/818.17
  6. Step 6: Final answer
    x = 647.10

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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.