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Finding the Fourth Proportional to 930.64, 1,281.36 and 708.88

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Solution

The fourth proportional to 930.64, 1,281.36 and 708.88 is: 976.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.64 : 1,281.36 = 708.88 : x
  2. Step 2: Convert to fraction form
    930.64/1,281.36 = 708.88/x
  3. Step 3: Cross multiply
    930.64x = 1,281.36 × 708.88
  4. Step 4: Simplify right side
    930.64x = 908,330.48
  5. Step 5: Solve for x
    x = 908,330.48/930.64
  6. Step 6: Final answer
    x = 976.03

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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.