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Finding the Fourth Proportional to 1,108.95, 1,530.37 and 611.61

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Solution

The fourth proportional to 1,108.95, 1,530.37 and 611.61 is: 844.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.95 : 1,530.37 = 611.61 : x
  2. Step 2: Convert to fraction form
    1,108.95/1,530.37 = 611.61/x
  3. Step 3: Cross multiply
    1,108.95x = 1,530.37 × 611.61
  4. Step 4: Simplify right side
    1,108.95x = 935,989.60
  5. Step 5: Solve for x
    x = 935,989.60/1,108.95
  6. Step 6: Final answer
    x = 844.03

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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.