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Finding the Fourth Proportional to 765.80, 1,056.87 and 451.07

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Solution

The fourth proportional to 765.80, 1,056.87 and 451.07 is: 622.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.80 : 1,056.87 = 451.07 : x
  2. Step 2: Convert to fraction form
    765.80/1,056.87 = 451.07/x
  3. Step 3: Cross multiply
    765.80x = 1,056.87 × 451.07
  4. Step 4: Simplify right side
    765.80x = 476,714.81
  5. Step 5: Solve for x
    x = 476,714.81/765.80
  6. Step 6: Final answer
    x = 622.51

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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.