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Finding the Fourth Proportional to 751.67, 1,036.78 and 486.11

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Solution

The fourth proportional to 751.67, 1,036.78 and 486.11 is: 670.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.67 : 1,036.78 = 486.11 : x
  2. Step 2: Convert to fraction form
    751.67/1,036.78 = 486.11/x
  3. Step 3: Cross multiply
    751.67x = 1,036.78 × 486.11
  4. Step 4: Simplify right side
    751.67x = 503,989.13
  5. Step 5: Solve for x
    x = 503,989.13/751.67
  6. Step 6: Final answer
    x = 670.49

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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.