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Finding the Fourth Proportional to 457.40, 630.94 and 291.34

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Solution

The fourth proportional to 457.40, 630.94 and 291.34 is: 401.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.40 : 630.94 = 291.34 : x
  2. Step 2: Convert to fraction form
    457.40/630.94 = 291.34/x
  3. Step 3: Cross multiply
    457.40x = 630.94 × 291.34
  4. Step 4: Simplify right side
    457.40x = 183,818.06
  5. Step 5: Solve for x
    x = 183,818.06/457.40
  6. Step 6: Final answer
    x = 401.88

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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.