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Finding the Fourth Proportional to 494.36, 681.85 and 428.75

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Solution

The fourth proportional to 494.36, 681.85 and 428.75 is: 591.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.36 : 681.85 = 428.75 : x
  2. Step 2: Convert to fraction form
    494.36/681.85 = 428.75/x
  3. Step 3: Cross multiply
    494.36x = 681.85 × 428.75
  4. Step 4: Simplify right side
    494.36x = 292,343.19
  5. Step 5: Solve for x
    x = 292,343.19/494.36
  6. Step 6: Final answer
    x = 591.36

Related Problems

Find fourth proportional to 247.18, 340.93 and 214.38
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Double scale
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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.