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Finding the Fourth Proportional to 1,271.31, 1,753.77 and 747

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Solution

The fourth proportional to 1,271.31, 1,753.77 and 747 is: 1,030.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.31 : 1,753.77 = 747 : x
  2. Step 2: Convert to fraction form
    1,271.31/1,753.77 = 747/x
  3. Step 3: Cross multiply
    1,271.31x = 1,753.77 × 747
  4. Step 4: Simplify right side
    1,271.31x = 1,310,066.19
  5. Step 5: Solve for x
    x = 1,310,066.19/1,271.31
  6. Step 6: Final answer
    x = 1,030.49

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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.