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Finding the Fourth Proportional to 1,855.64, 2,780.30 and 1,621.95

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Solution

The fourth proportional to 1,855.64, 2,780.30 and 1,621.95 is: 2,430.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,855.64 : 2,780.30 = 1,621.95 : x
  2. Step 2: Convert to fraction form
    1,855.64/2,780.30 = 1,621.95/x
  3. Step 3: Cross multiply
    1,855.64x = 2,780.30 × 1,621.95
  4. Step 4: Simplify right side
    1,855.64x = 4,509,499.48
  5. Step 5: Solve for x
    x = 4,509,499.48/1,855.64
  6. Step 6: Final answer
    x = 2,430.17

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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.