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Finding the Fourth Proportional to 818.07, 1,128.78 and 486.42

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Solution

The fourth proportional to 818.07, 1,128.78 and 486.42 is: 671.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.07 : 1,128.78 = 486.42 : x
  2. Step 2: Convert to fraction form
    818.07/1,128.78 = 486.42/x
  3. Step 3: Cross multiply
    818.07x = 1,128.78 × 486.42
  4. Step 4: Simplify right side
    818.07x = 549,061.17
  5. Step 5: Solve for x
    x = 549,061.17/818.07
  6. Step 6: Final answer
    x = 671.17

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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.