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Finding the Fourth Proportional to 825.51, 1,139.17 and 493.74

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Solution

The fourth proportional to 825.51, 1,139.17 and 493.74 is: 681.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.51 : 1,139.17 = 493.74 : x
  2. Step 2: Convert to fraction form
    825.51/1,139.17 = 493.74/x
  3. Step 3: Cross multiply
    825.51x = 1,139.17 × 493.74
  4. Step 4: Simplify right side
    825.51x = 562,452.56
  5. Step 5: Solve for x
    x = 562,452.56/825.51
  6. Step 6: Final answer
    x = 681.34

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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.