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Finding the Fourth Proportional to 930.70, 1,394.56 and 653.58

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Solution

The fourth proportional to 930.70, 1,394.56 and 653.58 is: 979.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.70 : 1,394.56 = 653.58 : x
  2. Step 2: Convert to fraction form
    930.70/1,394.56 = 653.58/x
  3. Step 3: Cross multiply
    930.70x = 1,394.56 × 653.58
  4. Step 4: Simplify right side
    930.70x = 911,456.52
  5. Step 5: Solve for x
    x = 911,456.52/930.70
  6. Step 6: Final answer
    x = 979.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.