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Finding the Fourth Proportional to 876.69, 1,209.44 and 561.81

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Solution

The fourth proportional to 876.69, 1,209.44 and 561.81 is: 775.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.69 : 1,209.44 = 561.81 : x
  2. Step 2: Convert to fraction form
    876.69/1,209.44 = 561.81/x
  3. Step 3: Cross multiply
    876.69x = 1,209.44 × 561.81
  4. Step 4: Simplify right side
    876.69x = 679,472.68
  5. Step 5: Solve for x
    x = 679,472.68/876.69
  6. Step 6: Final answer
    x = 775.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.