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Finding the Fourth Proportional to 918.72, 1,268.40 and 587.28

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Solution

The fourth proportional to 918.72, 1,268.40 and 587.28 is: 810.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.72 : 1,268.40 = 587.28 : x
  2. Step 2: Convert to fraction form
    918.72/1,268.40 = 587.28/x
  3. Step 3: Cross multiply
    918.72x = 1,268.40 × 587.28
  4. Step 4: Simplify right side
    918.72x = 744,905.95
  5. Step 5: Solve for x
    x = 744,905.95/918.72
  6. Step 6: Final answer
    x = 810.81

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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.