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Finding the Fourth Proportional to 919.81, 1,372.31 and 886.19

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Solution

The fourth proportional to 919.81, 1,372.31 and 886.19 is: 1,322.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.81 : 1,372.31 = 886.19 : x
  2. Step 2: Convert to fraction form
    919.81/1,372.31 = 886.19/x
  3. Step 3: Cross multiply
    919.81x = 1,372.31 × 886.19
  4. Step 4: Simplify right side
    919.81x = 1,216,126.40
  5. Step 5: Solve for x
    x = 1,216,126.40/919.81
  6. Step 6: Final answer
    x = 1,322.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.