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Finding the Fourth Proportional to 934.85, 1,289.80 and 561.64

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Solution

The fourth proportional to 934.85, 1,289.80 and 561.64 is: 774.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.85 : 1,289.80 = 561.64 : x
  2. Step 2: Convert to fraction form
    934.85/1,289.80 = 561.64/x
  3. Step 3: Cross multiply
    934.85x = 1,289.80 × 561.64
  4. Step 4: Simplify right side
    934.85x = 724,403.27
  5. Step 5: Solve for x
    x = 724,403.27/934.85
  6. Step 6: Final answer
    x = 774.89

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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.