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Finding the Fourth Proportional to 1,276.02, 1,761.09 and 708.99

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Solution

The fourth proportional to 1,276.02, 1,761.09 and 708.99 is: 978.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.02 : 1,761.09 = 708.99 : x
  2. Step 2: Convert to fraction form
    1,276.02/1,761.09 = 708.99/x
  3. Step 3: Cross multiply
    1,276.02x = 1,761.09 × 708.99
  4. Step 4: Simplify right side
    1,276.02x = 1,248,597.86
  5. Step 5: Solve for x
    x = 1,248,597.86/1,276.02
  6. Step 6: Final answer
    x = 978.51

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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.