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Finding the Fourth Proportional to 330.40, 456.36 and 312.16

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Solution

The fourth proportional to 330.40, 456.36 and 312.16 is: 431.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.40 : 456.36 = 312.16 : x
  2. Step 2: Convert to fraction form
    330.40/456.36 = 312.16/x
  3. Step 3: Cross multiply
    330.40x = 456.36 × 312.16
  4. Step 4: Simplify right side
    330.40x = 142,457.34
  5. Step 5: Solve for x
    x = 142,457.34/330.40
  6. Step 6: Final answer
    x = 431.17

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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.