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Finding the Fourth Proportional to 914.68, 1,368.94 and 640.12

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Solution

The fourth proportional to 914.68, 1,368.94 and 640.12 is: 958.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.68 : 1,368.94 = 640.12 : x
  2. Step 2: Convert to fraction form
    914.68/1,368.94 = 640.12/x
  3. Step 3: Cross multiply
    914.68x = 1,368.94 × 640.12
  4. Step 4: Simplify right side
    914.68x = 876,285.87
  5. Step 5: Solve for x
    x = 876,285.87/914.68
  6. Step 6: Final answer
    x = 958.02

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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.