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Finding the Fourth Proportional to 930.96, 1,284.72 and 511.36

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Solution

The fourth proportional to 930.96, 1,284.72 and 511.36 is: 705.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.96 : 1,284.72 = 511.36 : x
  2. Step 2: Convert to fraction form
    930.96/1,284.72 = 511.36/x
  3. Step 3: Cross multiply
    930.96x = 1,284.72 × 511.36
  4. Step 4: Simplify right side
    930.96x = 656,954.42
  5. Step 5: Solve for x
    x = 656,954.42/930.96
  6. Step 6: Final answer
    x = 705.67

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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.