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Finding the Fourth Proportional to 817.65, 1,128.52 and 486.01

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Solution

The fourth proportional to 817.65, 1,128.52 and 486.01 is: 670.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.65 : 1,128.52 = 486.01 : x
  2. Step 2: Convert to fraction form
    817.65/1,128.52 = 486.01/x
  3. Step 3: Cross multiply
    817.65x = 1,128.52 × 486.01
  4. Step 4: Simplify right side
    817.65x = 548,463.93
  5. Step 5: Solve for x
    x = 548,463.93/817.65
  6. Step 6: Final answer
    x = 670.78

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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.