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Finding the Fourth Proportional to 930.14, 1,280.67 and 708.38

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Solution

The fourth proportional to 930.14, 1,280.67 and 708.38 is: 975.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.14 : 1,280.67 = 708.38 : x
  2. Step 2: Convert to fraction form
    930.14/1,280.67 = 708.38/x
  3. Step 3: Cross multiply
    930.14x = 1,280.67 × 708.38
  4. Step 4: Simplify right side
    930.14x = 907,201.01
  5. Step 5: Solve for x
    x = 907,201.01/930.14
  6. Step 6: Final answer
    x = 975.34

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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.