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Finding the Fourth Proportional to 493.43, 681.23 and 438.76

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Solution

The fourth proportional to 493.43, 681.23 and 438.76 is: 605.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.43 : 681.23 = 438.76 : x
  2. Step 2: Convert to fraction form
    493.43/681.23 = 438.76/x
  3. Step 3: Cross multiply
    493.43x = 681.23 × 438.76
  4. Step 4: Simplify right side
    493.43x = 298,896.47
  5. Step 5: Solve for x
    x = 298,896.47/493.43
  6. Step 6: Final answer
    x = 605.75

Related Problems

Find fourth proportional to 246.72, 340.62 and 219.38
Half scale
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Double scale
Find fourth proportional to 494.43, 682.61 and 439.76
Similar ratio
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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.