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Finding the Fourth Proportional to 765.96, 1,057.78 and 654.79

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Solution

The fourth proportional to 765.96, 1,057.78 and 654.79 is: 904.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.96 : 1,057.78 = 654.79 : x
  2. Step 2: Convert to fraction form
    765.96/1,057.78 = 654.79/x
  3. Step 3: Cross multiply
    765.96x = 1,057.78 × 654.79
  4. Step 4: Simplify right side
    765.96x = 692,620.49
  5. Step 5: Solve for x
    x = 692,620.49/765.96
  6. Step 6: Final answer
    x = 904.25

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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.