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Finding the Fourth Proportional to 2,153.34, 3,230.07 and 920.76

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Solution

The fourth proportional to 2,153.34, 3,230.07 and 920.76 is: 1,381.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.34 : 3,230.07 = 920.76 : x
  2. Step 2: Convert to fraction form
    2,153.34/3,230.07 = 920.76/x
  3. Step 3: Cross multiply
    2,153.34x = 3,230.07 × 920.76
  4. Step 4: Simplify right side
    2,153.34x = 2,974,119.25
  5. Step 5: Solve for x
    x = 2,974,119.25/2,153.34
  6. Step 6: Final answer
    x = 1,381.17

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Similar ratio
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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.