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Finding the Fourth Proportional to 457.45, 631.40 and 291.80

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Solution

The fourth proportional to 457.45, 631.40 and 291.80 is: 402.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.45 : 631.40 = 291.80 : x
  2. Step 2: Convert to fraction form
    457.45/631.40 = 291.80/x
  3. Step 3: Cross multiply
    457.45x = 631.40 × 291.80
  4. Step 4: Simplify right side
    457.45x = 184,242.64
  5. Step 5: Solve for x
    x = 184,242.64/457.45
  6. Step 6: Final answer
    x = 402.76

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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.