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Finding the Fourth Proportional to 765.56, 1,056.40 and 455

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Solution

The fourth proportional to 765.56, 1,056.40 and 455 is: 627.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.56 : 1,056.40 = 455 : x
  2. Step 2: Convert to fraction form
    765.56/1,056.40 = 455/x
  3. Step 3: Cross multiply
    765.56x = 1,056.40 × 455
  4. Step 4: Simplify right side
    765.56x = 480,662.00
  5. Step 5: Solve for x
    x = 480,662.00/765.56
  6. Step 6: Final answer
    x = 627.86

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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.