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Finding the Fourth Proportional to 918.45, 1,267.41 and 525.48

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Solution

The fourth proportional to 918.45, 1,267.41 and 525.48 is: 725.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.45 : 1,267.41 = 525.48 : x
  2. Step 2: Convert to fraction form
    918.45/1,267.41 = 525.48/x
  3. Step 3: Cross multiply
    918.45x = 1,267.41 × 525.48
  4. Step 4: Simplify right side
    918.45x = 665,998.61
  5. Step 5: Solve for x
    x = 665,998.61/918.45
  6. Step 6: Final answer
    x = 725.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.