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Finding the Fourth Proportional to 712.78, 1,068.39 and 609.77

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Solution

The fourth proportional to 712.78, 1,068.39 and 609.77 is: 913.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.78 : 1,068.39 = 609.77 : x
  2. Step 2: Convert to fraction form
    712.78/1,068.39 = 609.77/x
  3. Step 3: Cross multiply
    712.78x = 1,068.39 × 609.77
  4. Step 4: Simplify right side
    712.78x = 651,472.17
  5. Step 5: Solve for x
    x = 651,472.17/712.78
  6. Step 6: Final answer
    x = 913.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.