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Finding the Fourth Proportional to 765.44, 1,056.48 and 455.12

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Solution

The fourth proportional to 765.44, 1,056.48 and 455.12 is: 628.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.44 : 1,056.48 = 455.12 : x
  2. Step 2: Convert to fraction form
    765.44/1,056.48 = 455.12/x
  3. Step 3: Cross multiply
    765.44x = 1,056.48 × 455.12
  4. Step 4: Simplify right side
    765.44x = 480,825.18
  5. Step 5: Solve for x
    x = 480,825.18/765.44
  6. Step 6: Final answer
    x = 628.17

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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.