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Finding the Fourth Proportional to 1,272.51, 1,756.08 and 713

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Solution

The fourth proportional to 1,272.51, 1,756.08 and 713 is: 983.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.51 : 1,756.08 = 713 : x
  2. Step 2: Convert to fraction form
    1,272.51/1,756.08 = 713/x
  3. Step 3: Cross multiply
    1,272.51x = 1,756.08 × 713
  4. Step 4: Simplify right side
    1,272.51x = 1,252,085.04
  5. Step 5: Solve for x
    x = 1,252,085.04/1,272.51
  6. Step 6: Final answer
    x = 983.95

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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.