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Finding the Fourth Proportional to 317.84, 434.72 and 312.80

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Solution

The fourth proportional to 317.84, 434.72 and 312.80 is: 427.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.84 : 434.72 = 312.80 : x
  2. Step 2: Convert to fraction form
    317.84/434.72 = 312.80/x
  3. Step 3: Cross multiply
    317.84x = 434.72 × 312.80
  4. Step 4: Simplify right side
    317.84x = 135,980.42
  5. Step 5: Solve for x
    x = 135,980.42/317.84
  6. Step 6: Final answer
    x = 427.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.