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Finding the Fourth Proportional to 914.49, 1,370.93 and 640.71

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Solution

The fourth proportional to 914.49, 1,370.93 and 640.71 is: 960.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.49 : 1,370.93 = 640.71 : x
  2. Step 2: Convert to fraction form
    914.49/1,370.93 = 640.71/x
  3. Step 3: Cross multiply
    914.49x = 1,370.93 × 640.71
  4. Step 4: Simplify right side
    914.49x = 878,365.36
  5. Step 5: Solve for x
    x = 878,365.36/914.49
  6. Step 6: Final answer
    x = 960.50

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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.