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Finding the Fourth Proportional to 918.80, 1,268.28 and 624.08

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Solution

The fourth proportional to 918.80, 1,268.28 and 624.08 is: 861.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.80 : 1,268.28 = 624.08 : x
  2. Step 2: Convert to fraction form
    918.80/1,268.28 = 624.08/x
  3. Step 3: Cross multiply
    918.80x = 1,268.28 × 624.08
  4. Step 4: Simplify right side
    918.80x = 791,508.18
  5. Step 5: Solve for x
    x = 791,508.18/918.80
  6. Step 6: Final answer
    x = 861.46

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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.