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Finding the Fourth Proportional to 749.88, 1,035.09 and 487.98

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Solution

The fourth proportional to 749.88, 1,035.09 and 487.98 is: 673.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.88 : 1,035.09 = 487.98 : x
  2. Step 2: Convert to fraction form
    749.88/1,035.09 = 487.98/x
  3. Step 3: Cross multiply
    749.88x = 1,035.09 × 487.98
  4. Step 4: Simplify right side
    749.88x = 505,103.22
  5. Step 5: Solve for x
    x = 505,103.22/749.88
  6. Step 6: Final answer
    x = 673.58

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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.