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Finding the Fourth Proportional to 1,205.71, 1,809.47 and 556.90

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Solution

The fourth proportional to 1,205.71, 1,809.47 and 556.90 is: 835.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.71 : 1,809.47 = 556.90 : x
  2. Step 2: Convert to fraction form
    1,205.71/1,809.47 = 556.90/x
  3. Step 3: Cross multiply
    1,205.71x = 1,809.47 × 556.90
  4. Step 4: Simplify right side
    1,205.71x = 1,007,690.71
  5. Step 5: Solve for x
    x = 1,007,690.71/1,205.71
  6. Step 6: Final answer
    x = 835.77

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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.