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Finding the Fourth Proportional to 918.84, 1,268.16 and 525.79

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Solution

The fourth proportional to 918.84, 1,268.16 and 525.79 is: 725.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.84 : 1,268.16 = 525.79 : x
  2. Step 2: Convert to fraction form
    918.84/1,268.16 = 525.79/x
  3. Step 3: Cross multiply
    918.84x = 1,268.16 × 525.79
  4. Step 4: Simplify right side
    918.84x = 666,785.46
  5. Step 5: Solve for x
    x = 666,785.46/918.84
  6. Step 6: Final answer
    x = 725.68

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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.