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Finding the Fourth Proportional to 810.10, 1,207.45 and 763.97

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Solution

The fourth proportional to 810.10, 1,207.45 and 763.97 is: 1,138.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.10 : 1,207.45 = 763.97 : x
  2. Step 2: Convert to fraction form
    810.10/1,207.45 = 763.97/x
  3. Step 3: Cross multiply
    810.10x = 1,207.45 × 763.97
  4. Step 4: Simplify right side
    810.10x = 922,455.58
  5. Step 5: Solve for x
    x = 922,455.58/810.10
  6. Step 6: Final answer
    x = 1,138.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.