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Finding the Fourth Proportional to 1,031.20, 1,539.31 and 955.06

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Solution

The fourth proportional to 1,031.20, 1,539.31 and 955.06 is: 1,425.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.20 : 1,539.31 = 955.06 : x
  2. Step 2: Convert to fraction form
    1,031.20/1,539.31 = 955.06/x
  3. Step 3: Cross multiply
    1,031.20x = 1,539.31 × 955.06
  4. Step 4: Simplify right side
    1,031.20x = 1,470,133.41
  5. Step 5: Solve for x
    x = 1,470,133.41/1,031.20
  6. Step 6: Final answer
    x = 1,425.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.