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Finding the Fourth Proportional to 491.64, 678.40 and 344.76

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Solution

The fourth proportional to 491.64, 678.40 and 344.76 is: 475.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.64 : 678.40 = 344.76 : x
  2. Step 2: Convert to fraction form
    491.64/678.40 = 344.76/x
  3. Step 3: Cross multiply
    491.64x = 678.40 × 344.76
  4. Step 4: Simplify right side
    491.64x = 233,885.18
  5. Step 5: Solve for x
    x = 233,885.18/491.64
  6. Step 6: Final answer
    x = 475.72

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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.