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Finding the Fourth Proportional to 459.40, 634.20 and 312.10

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Solution

The fourth proportional to 459.40, 634.20 and 312.10 is: 430.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.40 : 634.20 = 312.10 : x
  2. Step 2: Convert to fraction form
    459.40/634.20 = 312.10/x
  3. Step 3: Cross multiply
    459.40x = 634.20 × 312.10
  4. Step 4: Simplify right side
    459.40x = 197,933.82
  5. Step 5: Solve for x
    x = 197,933.82/459.40
  6. Step 6: Final answer
    x = 430.85

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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.