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Finding the Fourth Proportional to 771.71, 1,154.10 and 685.58

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Solution

The fourth proportional to 771.71, 1,154.10 and 685.58 is: 1,025.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.71 : 1,154.10 = 685.58 : x
  2. Step 2: Convert to fraction form
    771.71/1,154.10 = 685.58/x
  3. Step 3: Cross multiply
    771.71x = 1,154.10 × 685.58
  4. Step 4: Simplify right side
    771.71x = 791,222.11
  5. Step 5: Solve for x
    x = 791,222.11/771.71
  6. Step 6: Final answer
    x = 1,025.29

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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.