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Finding the Fourth Proportional to 1,056.86, 1,587.69 and 765.26

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Solution

The fourth proportional to 1,056.86, 1,587.69 and 765.26 is: 1,149.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.86 : 1,587.69 = 765.26 : x
  2. Step 2: Convert to fraction form
    1,056.86/1,587.69 = 765.26/x
  3. Step 3: Cross multiply
    1,056.86x = 1,587.69 × 765.26
  4. Step 4: Simplify right side
    1,056.86x = 1,214,995.65
  5. Step 5: Solve for x
    x = 1,214,995.65/1,056.86
  6. Step 6: Final answer
    x = 1,149.63

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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.