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Finding the Fourth Proportional to 919.53, 1,376.06 and 640.53

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Solution

The fourth proportional to 919.53, 1,376.06 and 640.53 is: 958.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.53 : 1,376.06 = 640.53 : x
  2. Step 2: Convert to fraction form
    919.53/1,376.06 = 640.53/x
  3. Step 3: Cross multiply
    919.53x = 1,376.06 × 640.53
  4. Step 4: Simplify right side
    919.53x = 881,404.51
  5. Step 5: Solve for x
    x = 881,404.51/919.53
  6. Step 6: Final answer
    x = 958.54

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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.