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Finding the Fourth Proportional to 918.54, 1,375.50 and 609.45

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Solution

The fourth proportional to 918.54, 1,375.50 and 609.45 is: 912.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.54 : 1,375.50 = 609.45 : x
  2. Step 2: Convert to fraction form
    918.54/1,375.50 = 609.45/x
  3. Step 3: Cross multiply
    918.54x = 1,375.50 × 609.45
  4. Step 4: Simplify right side
    918.54x = 838,298.48
  5. Step 5: Solve for x
    x = 838,298.48/918.54
  6. Step 6: Final answer
    x = 912.64

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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.