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Finding the Fourth Proportional to 965.48, 1,330.98 and 689

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Solution

The fourth proportional to 965.48, 1,330.98 and 689 is: 949.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.48 : 1,330.98 = 689 : x
  2. Step 2: Convert to fraction form
    965.48/1,330.98 = 689/x
  3. Step 3: Cross multiply
    965.48x = 1,330.98 × 689
  4. Step 4: Simplify right side
    965.48x = 917,045.22
  5. Step 5: Solve for x
    x = 917,045.22/965.48
  6. Step 6: Final answer
    x = 949.83

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1.5x scale

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.