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Finding the Fourth Proportional to 918.90, 1,268.19 and 525.94

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Solution

The fourth proportional to 918.90, 1,268.19 and 525.94 is: 725.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.90 : 1,268.19 = 525.94 : x
  2. Step 2: Convert to fraction form
    918.90/1,268.19 = 525.94/x
  3. Step 3: Cross multiply
    918.90x = 1,268.19 × 525.94
  4. Step 4: Simplify right side
    918.90x = 666,988.68
  5. Step 5: Solve for x
    x = 666,988.68/918.90
  6. Step 6: Final answer
    x = 725.86

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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.