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Finding the Fourth Proportional to 965.86, 1,445.67 and 688.05

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Solution

The fourth proportional to 965.86, 1,445.67 and 688.05 is: 1,029.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.86 : 1,445.67 = 688.05 : x
  2. Step 2: Convert to fraction form
    965.86/1,445.67 = 688.05/x
  3. Step 3: Cross multiply
    965.86x = 1,445.67 × 688.05
  4. Step 4: Simplify right side
    965.86x = 994,693.24
  5. Step 5: Solve for x
    x = 994,693.24/965.86
  6. Step 6: Final answer
    x = 1,029.86

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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.