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Finding the Fourth Proportional to 817.95, 1,128.66 and 486.32

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Solution

The fourth proportional to 817.95, 1,128.66 and 486.32 is: 671.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.95 : 1,128.66 = 486.32 : x
  2. Step 2: Convert to fraction form
    817.95/1,128.66 = 486.32/x
  3. Step 3: Cross multiply
    817.95x = 1,128.66 × 486.32
  4. Step 4: Simplify right side
    817.95x = 548,889.93
  5. Step 5: Solve for x
    x = 548,889.93/817.95
  6. Step 6: Final answer
    x = 671.06

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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.