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Finding the Fourth Proportional to 1,031, 1,422.80 and 617

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Solution

The fourth proportional to 1,031, 1,422.80 and 617 is: 851.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031 : 1,422.80 = 617 : x
  2. Step 2: Convert to fraction form
    1,031/1,422.80 = 617/x
  3. Step 3: Cross multiply
    1,031x = 1,422.80 × 617
  4. Step 4: Simplify right side
    1,031x = 877,867.60
  5. Step 5: Solve for x
    x = 877,867.60/1,031
  6. Step 6: Final answer
    x = 851.47

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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.