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Finding the Fourth Proportional to 685.56, 1,022.19 and 612.48

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Solution

The fourth proportional to 685.56, 1,022.19 and 612.48 is: 913.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.56 : 1,022.19 = 612.48 : x
  2. Step 2: Convert to fraction form
    685.56/1,022.19 = 612.48/x
  3. Step 3: Cross multiply
    685.56x = 1,022.19 × 612.48
  4. Step 4: Simplify right side
    685.56x = 626,070.93
  5. Step 5: Solve for x
    x = 626,070.93/685.56
  6. Step 6: Final answer
    x = 913.23

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Double scale
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1.5x scale

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.