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Finding the Fourth Proportional to 771.60, 1,154.70 and 539.40

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Solution

The fourth proportional to 771.60, 1,154.70 and 539.40 is: 807.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.60 : 1,154.70 = 539.40 : x
  2. Step 2: Convert to fraction form
    771.60/1,154.70 = 539.40/x
  3. Step 3: Cross multiply
    771.60x = 1,154.70 × 539.40
  4. Step 4: Simplify right side
    771.60x = 622,845.18
  5. Step 5: Solve for x
    x = 622,845.18/771.60
  6. Step 6: Final answer
    x = 807.21

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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.