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Finding the Fourth Proportional to 348, 521.28 and 320

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Solution

The fourth proportional to 348, 521.28 and 320 is: 479.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    348 : 521.28 = 320 : x
  2. Step 2: Convert to fraction form
    348/521.28 = 320/x
  3. Step 3: Cross multiply
    348x = 521.28 × 320
  4. Step 4: Simplify right side
    348x = 166,809.60
  5. Step 5: Solve for x
    x = 166,809.60/348
  6. Step 6: Final answer
    x = 479.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.