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Finding the Fourth Proportional to 964.39, 1,330.05 and 628.38

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Solution

The fourth proportional to 964.39, 1,330.05 and 628.38 is: 866.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.39 : 1,330.05 = 628.38 : x
  2. Step 2: Convert to fraction form
    964.39/1,330.05 = 628.38/x
  3. Step 3: Cross multiply
    964.39x = 1,330.05 × 628.38
  4. Step 4: Simplify right side
    964.39x = 835,776.82
  5. Step 5: Solve for x
    x = 835,776.82/964.39
  6. Step 6: Final answer
    x = 866.64

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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.