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Finding the Fourth Proportional to 875.79, 1,208.79 and 561.33

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Solution

The fourth proportional to 875.79, 1,208.79 and 561.33 is: 774.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.79 : 1,208.79 = 561.33 : x
  2. Step 2: Convert to fraction form
    875.79/1,208.79 = 561.33/x
  3. Step 3: Cross multiply
    875.79x = 1,208.79 × 561.33
  4. Step 4: Simplify right side
    875.79x = 678,530.09
  5. Step 5: Solve for x
    x = 678,530.09/875.79
  6. Step 6: Final answer
    x = 774.76

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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.