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Finding the Fourth Proportional to 1,108.76, 1,530.07 and 611.40

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Solution

The fourth proportional to 1,108.76, 1,530.07 and 611.40 is: 843.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.76 : 1,530.07 = 611.40 : x
  2. Step 2: Convert to fraction form
    1,108.76/1,530.07 = 611.40/x
  3. Step 3: Cross multiply
    1,108.76x = 1,530.07 × 611.40
  4. Step 4: Simplify right side
    1,108.76x = 935,484.80
  5. Step 5: Solve for x
    x = 935,484.80/1,108.76
  6. Step 6: Final answer
    x = 843.72

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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.