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Finding the Fourth Proportional to 953.69, 1,431.86 and 491.81

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Solution

The fourth proportional to 953.69, 1,431.86 and 491.81 is: 738.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.69 : 1,431.86 = 491.81 : x
  2. Step 2: Convert to fraction form
    953.69/1,431.86 = 491.81/x
  3. Step 3: Cross multiply
    953.69x = 1,431.86 × 491.81
  4. Step 4: Simplify right side
    953.69x = 704,193.45
  5. Step 5: Solve for x
    x = 704,193.45/953.69
  6. Step 6: Final answer
    x = 738.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.