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Finding the Fourth Proportional to 356.60, 533.40 and 320.30

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Solution

The fourth proportional to 356.60, 533.40 and 320.30 is: 479.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.60 : 533.40 = 320.30 : x
  2. Step 2: Convert to fraction form
    356.60/533.40 = 320.30/x
  3. Step 3: Cross multiply
    356.60x = 533.40 × 320.30
  4. Step 4: Simplify right side
    356.60x = 170,848.02
  5. Step 5: Solve for x
    x = 170,848.02/356.60
  6. Step 6: Final answer
    x = 479.10

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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.