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Finding the Fourth Proportional to 934.31, 1,289.43 and 561.39

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Solution

The fourth proportional to 934.31, 1,289.43 and 561.39 is: 774.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.31 : 1,289.43 = 561.39 : x
  2. Step 2: Convert to fraction form
    934.31/1,289.43 = 561.39/x
  3. Step 3: Cross multiply
    934.31x = 1,289.43 × 561.39
  4. Step 4: Simplify right side
    934.31x = 723,873.11
  5. Step 5: Solve for x
    x = 723,873.11/934.31
  6. Step 6: Final answer
    x = 774.77

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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.