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Finding the Fourth Proportional to 1,031.76, 1,422.58 and 898.49

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Solution

The fourth proportional to 1,031.76, 1,422.58 and 898.49 is: 1,238.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.76 : 1,422.58 = 898.49 : x
  2. Step 2: Convert to fraction form
    1,031.76/1,422.58 = 898.49/x
  3. Step 3: Cross multiply
    1,031.76x = 1,422.58 × 898.49
  4. Step 4: Simplify right side
    1,031.76x = 1,278,173.11
  5. Step 5: Solve for x
    x = 1,278,173.11/1,031.76
  6. Step 6: Final answer
    x = 1,238.82

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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.