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Finding the Fourth Proportional to 930.96, 1,284.28 and 709.84

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Solution

The fourth proportional to 930.96, 1,284.28 and 709.84 is: 979.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.96 : 1,284.28 = 709.84 : x
  2. Step 2: Convert to fraction form
    930.96/1,284.28 = 709.84/x
  3. Step 3: Cross multiply
    930.96x = 1,284.28 × 709.84
  4. Step 4: Simplify right side
    930.96x = 911,633.32
  5. Step 5: Solve for x
    x = 911,633.32/930.96
  6. Step 6: Final answer
    x = 979.24

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Double scale
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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.