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Finding the Fourth Proportional to 765.10, 1,055.23 and 485.06

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Solution

The fourth proportional to 765.10, 1,055.23 and 485.06 is: 668.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.10 : 1,055.23 = 485.06 : x
  2. Step 2: Convert to fraction form
    765.10/1,055.23 = 485.06/x
  3. Step 3: Cross multiply
    765.10x = 1,055.23 × 485.06
  4. Step 4: Simplify right side
    765.10x = 511,843.38
  5. Step 5: Solve for x
    x = 511,843.38/765.10
  6. Step 6: Final answer
    x = 668.99

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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.