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Finding the Fourth Proportional to 674.54, 931.24 and 621.84

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Solution

The fourth proportional to 674.54, 931.24 and 621.84 is: 858.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.54 : 931.24 = 621.84 : x
  2. Step 2: Convert to fraction form
    674.54/931.24 = 621.84/x
  3. Step 3: Cross multiply
    674.54x = 931.24 × 621.84
  4. Step 4: Simplify right side
    674.54x = 579,082.28
  5. Step 5: Solve for x
    x = 579,082.28/674.54
  6. Step 6: Final answer
    x = 858.48

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Double scale
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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.