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Finding the Fourth Proportional to 771.47, 1,160.14 and 615.65

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Solution

The fourth proportional to 771.47, 1,160.14 and 615.65 is: 925.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.47 : 1,160.14 = 615.65 : x
  2. Step 2: Convert to fraction form
    771.47/1,160.14 = 615.65/x
  3. Step 3: Cross multiply
    771.47x = 1,160.14 × 615.65
  4. Step 4: Simplify right side
    771.47x = 714,232.85
  5. Step 5: Solve for x
    x = 714,232.85/771.47
  6. Step 6: Final answer
    x = 925.81

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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.