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Finding the Fourth Proportional to 918.75, 1,379.50 and 372.00

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Solution

The fourth proportional to 918.75, 1,379.50 and 372.00 is: 558.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.75 : 1,379.50 = 372.00 : x
  2. Step 2: Convert to fraction form
    918.75/1,379.50 = 372.00/x
  3. Step 3: Cross multiply
    918.75x = 1,379.50 × 372.00
  4. Step 4: Simplify right side
    918.75x = 513,178.24
  5. Step 5: Solve for x
    x = 513,178.24/918.75
  6. Step 6: Final answer
    x = 558.56

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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.