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Finding the Fourth Proportional to 783.34, 1,079.94 and 561.88

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Solution

The fourth proportional to 783.34, 1,079.94 and 561.88 is: 774.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.34 : 1,079.94 = 561.88 : x
  2. Step 2: Convert to fraction form
    783.34/1,079.94 = 561.88/x
  3. Step 3: Cross multiply
    783.34x = 1,079.94 × 561.88
  4. Step 4: Simplify right side
    783.34x = 606,796.69
  5. Step 5: Solve for x
    x = 606,796.69/783.34
  6. Step 6: Final answer
    x = 774.63

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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.