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Finding the Fourth Proportional to 811.61, 1,118.36 and 760.58

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Solution

The fourth proportional to 811.61, 1,118.36 and 760.58 is: 1,048.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.61 : 1,118.36 = 760.58 : x
  2. Step 2: Convert to fraction form
    811.61/1,118.36 = 760.58/x
  3. Step 3: Cross multiply
    811.61x = 1,118.36 × 760.58
  4. Step 4: Simplify right side
    811.61x = 850,592.85
  5. Step 5: Solve for x
    x = 850,592.85/811.61
  6. Step 6: Final answer
    x = 1,048.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.