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Finding the Fourth Proportional to 930.43, 1,390.33 and 669.20

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Solution

The fourth proportional to 930.43, 1,390.33 and 669.20 is: 999.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.43 : 1,390.33 = 669.20 : x
  2. Step 2: Convert to fraction form
    930.43/1,390.33 = 669.20/x
  3. Step 3: Cross multiply
    930.43x = 1,390.33 × 669.20
  4. Step 4: Simplify right side
    930.43x = 930,405.49
  5. Step 5: Solve for x
    x = 930,405.49/930.43
  6. Step 6: Final answer
    x = 999.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.