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Finding the Fourth Proportional to 2,806.78, 3,873.36 and 1,564.78

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Solution

The fourth proportional to 2,806.78, 3,873.36 and 1,564.78 is: 2,159.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,806.78 : 3,873.36 = 1,564.78 : x
  2. Step 2: Convert to fraction form
    2,806.78/3,873.36 = 1,564.78/x
  3. Step 3: Cross multiply
    2,806.78x = 3,873.36 × 1,564.78
  4. Step 4: Simplify right side
    2,806.78x = 6,060,956.26
  5. Step 5: Solve for x
    x = 6,060,956.26/2,806.78
  6. Step 6: Final answer
    x = 2,159.40

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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.