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Finding the Fourth Proportional to 1,585.95, 2,379.24 and 765.21

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Solution

The fourth proportional to 1,585.95, 2,379.24 and 765.21 is: 1,147.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.95 : 2,379.24 = 765.21 : x
  2. Step 2: Convert to fraction form
    1,585.95/2,379.24 = 765.21/x
  3. Step 3: Cross multiply
    1,585.95x = 2,379.24 × 765.21
  4. Step 4: Simplify right side
    1,585.95x = 1,820,627.16
  5. Step 5: Solve for x
    x = 1,820,627.16/1,585.95
  6. Step 6: Final answer
    x = 1,147.98

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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.