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Finding the Fourth Proportional to 918.10, 1,378.80 and 804.70

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Solution

The fourth proportional to 918.10, 1,378.80 and 804.70 is: 1,208.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.10 : 1,378.80 = 804.70 : x
  2. Step 2: Convert to fraction form
    918.10/1,378.80 = 804.70/x
  3. Step 3: Cross multiply
    918.10x = 1,378.80 × 804.70
  4. Step 4: Simplify right side
    918.10x = 1,109,520.36
  5. Step 5: Solve for x
    x = 1,109,520.36/918.10
  6. Step 6: Final answer
    x = 1,208.50

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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.