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Finding the Fourth Proportional to 1,262.31, 1,742.48 and 870.67

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Solution

The fourth proportional to 1,262.31, 1,742.48 and 870.67 is: 1,201.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.31 : 1,742.48 = 870.67 : x
  2. Step 2: Convert to fraction form
    1,262.31/1,742.48 = 870.67/x
  3. Step 3: Cross multiply
    1,262.31x = 1,742.48 × 870.67
  4. Step 4: Simplify right side
    1,262.31x = 1,517,125.06
  5. Step 5: Solve for x
    x = 1,517,125.06/1,262.31
  6. Step 6: Final answer
    x = 1,201.86

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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.