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Finding the Fourth Proportional to 1,205.76, 1,809.05 and 556

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Solution

The fourth proportional to 1,205.76, 1,809.05 and 556 is: 834.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.76 : 1,809.05 = 556 : x
  2. Step 2: Convert to fraction form
    1,205.76/1,809.05 = 556/x
  3. Step 3: Cross multiply
    1,205.76x = 1,809.05 × 556
  4. Step 4: Simplify right side
    1,205.76x = 1,005,831.80
  5. Step 5: Solve for x
    x = 1,005,831.80/1,205.76
  6. Step 6: Final answer
    x = 834.19

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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.