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Finding the Fourth Proportional to 899.52, 1,242.50 and 688.42

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Solution

The fourth proportional to 899.52, 1,242.50 and 688.42 is: 950.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.52 : 1,242.50 = 688.42 : x
  2. Step 2: Convert to fraction form
    899.52/1,242.50 = 688.42/x
  3. Step 3: Cross multiply
    899.52x = 1,242.50 × 688.42
  4. Step 4: Simplify right side
    899.52x = 855,361.85
  5. Step 5: Solve for x
    x = 855,361.85/899.52
  6. Step 6: Final answer
    x = 950.91

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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.