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Finding the Fourth Proportional to 830.32, 1,144.92 and 690

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Solution

The fourth proportional to 830.32, 1,144.92 and 690 is: 951.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.32 : 1,144.92 = 690 : x
  2. Step 2: Convert to fraction form
    830.32/1,144.92 = 690/x
  3. Step 3: Cross multiply
    830.32x = 1,144.92 × 690
  4. Step 4: Simplify right side
    830.32x = 789,994.80
  5. Step 5: Solve for x
    x = 789,994.80/830.32
  6. Step 6: Final answer
    x = 951.43

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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.