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Finding the Fourth Proportional to 751.23, 1,036.79 and 419.67

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Solution

The fourth proportional to 751.23, 1,036.79 and 419.67 is: 579.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.23 : 1,036.79 = 419.67 : x
  2. Step 2: Convert to fraction form
    751.23/1,036.79 = 419.67/x
  3. Step 3: Cross multiply
    751.23x = 1,036.79 × 419.67
  4. Step 4: Simplify right side
    751.23x = 435,114.60
  5. Step 5: Solve for x
    x = 435,114.60/751.23
  6. Step 6: Final answer
    x = 579.21

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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.