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Finding the Fourth Proportional to 551.20, 760.70 and 330.16

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Solution

The fourth proportional to 551.20, 760.70 and 330.16 is: 455.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.20 : 760.70 = 330.16 : x
  2. Step 2: Convert to fraction form
    551.20/760.70 = 330.16/x
  3. Step 3: Cross multiply
    551.20x = 760.70 × 330.16
  4. Step 4: Simplify right side
    551.20x = 251,152.71
  5. Step 5: Solve for x
    x = 251,152.71/551.20
  6. Step 6: Final answer
    x = 455.65

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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.