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Finding the Fourth Proportional to 964.48, 1,329.60 and 688

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Solution

The fourth proportional to 964.48, 1,329.60 and 688 is: 948.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.48 : 1,329.60 = 688 : x
  2. Step 2: Convert to fraction form
    964.48/1,329.60 = 688/x
  3. Step 3: Cross multiply
    964.48x = 1,329.60 × 688
  4. Step 4: Simplify right side
    964.48x = 914,764.80
  5. Step 5: Solve for x
    x = 914,764.80/964.48
  6. Step 6: Final answer
    x = 948.45

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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.