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Finding the Fourth Proportional to 771.54, 1,063.68 and 614.70

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Solution

The fourth proportional to 771.54, 1,063.68 and 614.70 is: 847.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.54 : 1,063.68 = 614.70 : x
  2. Step 2: Convert to fraction form
    771.54/1,063.68 = 614.70/x
  3. Step 3: Cross multiply
    771.54x = 1,063.68 × 614.70
  4. Step 4: Simplify right side
    771.54x = 653,844.10
  5. Step 5: Solve for x
    x = 653,844.10/771.54
  6. Step 6: Final answer
    x = 847.45

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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.