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Finding the Fourth Proportional to 818.66, 1,129.35 and 486.98

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Solution

The fourth proportional to 818.66, 1,129.35 and 486.98 is: 671.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.66 : 1,129.35 = 486.98 : x
  2. Step 2: Convert to fraction form
    818.66/1,129.35 = 486.98/x
  3. Step 3: Cross multiply
    818.66x = 1,129.35 × 486.98
  4. Step 4: Simplify right side
    818.66x = 549,970.86
  5. Step 5: Solve for x
    x = 549,970.86/818.66
  6. Step 6: Final answer
    x = 671.79

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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.