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Finding the Fourth Proportional to 1,210.64, 1,815.80 and 388.99

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Solution

The fourth proportional to 1,210.64, 1,815.80 and 388.99 is: 583.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.64 : 1,815.80 = 388.99 : x
  2. Step 2: Convert to fraction form
    1,210.64/1,815.80 = 388.99/x
  3. Step 3: Cross multiply
    1,210.64x = 1,815.80 × 388.99
  4. Step 4: Simplify right side
    1,210.64x = 706,321.56
  5. Step 5: Solve for x
    x = 706,321.56/1,210.64
  6. Step 6: Final answer
    x = 583.43

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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.