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Finding the Fourth Proportional to 965.79, 1,330.53 and 670.55

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Solution

The fourth proportional to 965.79, 1,330.53 and 670.55 is: 923.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.79 : 1,330.53 = 670.55 : x
  2. Step 2: Convert to fraction form
    965.79/1,330.53 = 670.55/x
  3. Step 3: Cross multiply
    965.79x = 1,330.53 × 670.55
  4. Step 4: Simplify right side
    965.79x = 892,186.89
  5. Step 5: Solve for x
    x = 892,186.89/965.79
  6. Step 6: Final answer
    x = 923.79

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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.