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Finding the Fourth Proportional to 919.64, 1,378.44 and 607.16

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Solution

The fourth proportional to 919.64, 1,378.44 and 607.16 is: 910.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.64 : 1,378.44 = 607.16 : x
  2. Step 2: Convert to fraction form
    919.64/1,378.44 = 607.16/x
  3. Step 3: Cross multiply
    919.64x = 1,378.44 × 607.16
  4. Step 4: Simplify right side
    919.64x = 836,933.63
  5. Step 5: Solve for x
    x = 836,933.63/919.64
  6. Step 6: Final answer
    x = 910.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.