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Finding the Fourth Proportional to 2,655.19, 3,981.46 and 805.87

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Solution

The fourth proportional to 2,655.19, 3,981.46 and 805.87 is: 1,208.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,655.19 : 3,981.46 = 805.87 : x
  2. Step 2: Convert to fraction form
    2,655.19/3,981.46 = 805.87/x
  3. Step 3: Cross multiply
    2,655.19x = 3,981.46 × 805.87
  4. Step 4: Simplify right side
    2,655.19x = 3,208,539.17
  5. Step 5: Solve for x
    x = 3,208,539.17/2,655.19
  6. Step 6: Final answer
    x = 1,208.40

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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.