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Finding the Fourth Proportional to 918.20, 1,376.22 and 553.16

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Solution

The fourth proportional to 918.20, 1,376.22 and 553.16 is: 829.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.20 : 1,376.22 = 553.16 : x
  2. Step 2: Convert to fraction form
    918.20/1,376.22 = 553.16/x
  3. Step 3: Cross multiply
    918.20x = 1,376.22 × 553.16
  4. Step 4: Simplify right side
    918.20x = 761,269.86
  5. Step 5: Solve for x
    x = 761,269.86/918.20
  6. Step 6: Final answer
    x = 829.09

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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.