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Finding the Fourth Proportional to 727.60, 1,086.78 and 625.18

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Solution

The fourth proportional to 727.60, 1,086.78 and 625.18 is: 933.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.60 : 1,086.78 = 625.18 : x
  2. Step 2: Convert to fraction form
    727.60/1,086.78 = 625.18/x
  3. Step 3: Cross multiply
    727.60x = 1,086.78 × 625.18
  4. Step 4: Simplify right side
    727.60x = 679,433.12
  5. Step 5: Solve for x
    x = 679,433.12/727.60
  6. Step 6: Final answer
    x = 933.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.