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Finding the Fourth Proportional to 751.87, 1,037.54 and 420.29

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Solution

The fourth proportional to 751.87, 1,037.54 and 420.29 is: 579.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.87 : 1,037.54 = 420.29 : x
  2. Step 2: Convert to fraction form
    751.87/1,037.54 = 420.29/x
  3. Step 3: Cross multiply
    751.87x = 1,037.54 × 420.29
  4. Step 4: Simplify right side
    751.87x = 436,067.69
  5. Step 5: Solve for x
    x = 436,067.69/751.87
  6. Step 6: Final answer
    x = 579.98

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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.