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Finding the Fourth Proportional to 810.26, 1,117.43 and 685.79

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Solution

The fourth proportional to 810.26, 1,117.43 and 685.79 is: 945.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.26 : 1,117.43 = 685.79 : x
  2. Step 2: Convert to fraction form
    810.26/1,117.43 = 685.79/x
  3. Step 3: Cross multiply
    810.26x = 1,117.43 × 685.79
  4. Step 4: Simplify right side
    810.26x = 766,313.30
  5. Step 5: Solve for x
    x = 766,313.30/810.26
  6. Step 6: Final answer
    x = 945.77

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1.5x scale

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.