Home / 1,276.30-1,761.23-709.11

Finding the Fourth Proportional to 1,276.30, 1,761.23 and 709.11

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Solution

The fourth proportional to 1,276.30, 1,761.23 and 709.11 is: 978.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.30 : 1,761.23 = 709.11 : x
  2. Step 2: Convert to fraction form
    1,276.30/1,761.23 = 709.11/x
  3. Step 3: Cross multiply
    1,276.30x = 1,761.23 × 709.11
  4. Step 4: Simplify right side
    1,276.30x = 1,248,905.81
  5. Step 5: Solve for x
    x = 1,248,905.81/1,276.30
  6. Step 6: Final answer
    x = 978.54

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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.