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Finding the Fourth Proportional to 930.32, 1,283.64 and 620.72

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Solution

The fourth proportional to 930.32, 1,283.64 and 620.72 is: 856.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.32 : 1,283.64 = 620.72 : x
  2. Step 2: Convert to fraction form
    930.32/1,283.64 = 620.72/x
  3. Step 3: Cross multiply
    930.32x = 1,283.64 × 620.72
  4. Step 4: Simplify right side
    930.32x = 796,781.02
  5. Step 5: Solve for x
    x = 796,781.02/930.32
  6. Step 6: Final answer
    x = 856.46

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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.