Home / 1,356.19-1,871.55-766.87

Finding the Fourth Proportional to 1,356.19, 1,871.55 and 766.87

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Solution

The fourth proportional to 1,356.19, 1,871.55 and 766.87 is: 1,058.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.19 : 1,871.55 = 766.87 : x
  2. Step 2: Convert to fraction form
    1,356.19/1,871.55 = 766.87/x
  3. Step 3: Cross multiply
    1,356.19x = 1,871.55 × 766.87
  4. Step 4: Simplify right side
    1,356.19x = 1,435,230.87
  5. Step 5: Solve for x
    x = 1,435,230.87/1,356.19
  6. Step 6: Final answer
    x = 1,058.28

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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.