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Finding the Fourth Proportional to 2,812.79, 3,881.69 and 1,553.84

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Solution

The fourth proportional to 2,812.79, 3,881.69 and 1,553.84 is: 2,144.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.79 : 3,881.69 = 1,553.84 : x
  2. Step 2: Convert to fraction form
    2,812.79/3,881.69 = 1,553.84/x
  3. Step 3: Cross multiply
    2,812.79x = 3,881.69 × 1,553.84
  4. Step 4: Simplify right side
    2,812.79x = 6,031,518.40
  5. Step 5: Solve for x
    x = 6,031,518.40/2,812.79
  6. Step 6: Final answer
    x = 2,144.32

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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.