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Finding the Fourth Proportional to 1,356.70, 1,871.76 and 767.23

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Solution

The fourth proportional to 1,356.70, 1,871.76 and 767.23 is: 1,058.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.70 : 1,871.76 = 767.23 : x
  2. Step 2: Convert to fraction form
    1,356.70/1,871.76 = 767.23/x
  3. Step 3: Cross multiply
    1,356.70x = 1,871.76 × 767.23
  4. Step 4: Simplify right side
    1,356.70x = 1,436,070.42
  5. Step 5: Solve for x
    x = 1,436,070.42/1,356.70
  6. Step 6: Final answer
    x = 1,058.50

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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.