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Finding the Fourth Proportional to 930.12, 1,281.78 and 696.84

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Solution

The fourth proportional to 930.12, 1,281.78 and 696.84 is: 960.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.12 : 1,281.78 = 696.84 : x
  2. Step 2: Convert to fraction form
    930.12/1,281.78 = 696.84/x
  3. Step 3: Cross multiply
    930.12x = 1,281.78 × 696.84
  4. Step 4: Simplify right side
    930.12x = 893,195.58
  5. Step 5: Solve for x
    x = 893,195.58/930.12
  6. Step 6: Final answer
    x = 960.30

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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.