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Finding the Fourth Proportional to 1,031.76, 1,425.06 and 836.28

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Solution

The fourth proportional to 1,031.76, 1,425.06 and 836.28 is: 1,155.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.76 : 1,425.06 = 836.28 : x
  2. Step 2: Convert to fraction form
    1,031.76/1,425.06 = 836.28/x
  3. Step 3: Cross multiply
    1,031.76x = 1,425.06 × 836.28
  4. Step 4: Simplify right side
    1,031.76x = 1,191,749.18
  5. Step 5: Solve for x
    x = 1,191,749.18/1,031.76
  6. Step 6: Final answer
    x = 1,155.06

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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.