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Finding the Fourth Proportional to 469.36, 647.88 and 330.24

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Solution

The fourth proportional to 469.36, 647.88 and 330.24 is: 455.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.36 : 647.88 = 330.24 : x
  2. Step 2: Convert to fraction form
    469.36/647.88 = 330.24/x
  3. Step 3: Cross multiply
    469.36x = 647.88 × 330.24
  4. Step 4: Simplify right side
    469.36x = 213,955.89
  5. Step 5: Solve for x
    x = 213,955.89/469.36
  6. Step 6: Final answer
    x = 455.85

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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.