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Finding the Fourth Proportional to 930.80, 1,281.74 and 668.36

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Solution

The fourth proportional to 930.80, 1,281.74 and 668.36 is: 920.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.80 : 1,281.74 = 668.36 : x
  2. Step 2: Convert to fraction form
    930.80/1,281.74 = 668.36/x
  3. Step 3: Cross multiply
    930.80x = 1,281.74 × 668.36
  4. Step 4: Simplify right side
    930.80x = 856,663.75
  5. Step 5: Solve for x
    x = 856,663.75/930.80
  6. Step 6: Final answer
    x = 920.35

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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.