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Finding the Fourth Proportional to 919.92, 1,373.13 and 810.54

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Solution

The fourth proportional to 919.92, 1,373.13 and 810.54 is: 1,209.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.92 : 1,373.13 = 810.54 : x
  2. Step 2: Convert to fraction form
    919.92/1,373.13 = 810.54/x
  3. Step 3: Cross multiply
    919.92x = 1,373.13 × 810.54
  4. Step 4: Simplify right side
    919.92x = 1,112,976.79
  5. Step 5: Solve for x
    x = 1,112,976.79/919.92
  6. Step 6: Final answer
    x = 1,209.86

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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.