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Finding the Fourth Proportional to 529.55, 730.74 and 311.08

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Solution

The fourth proportional to 529.55, 730.74 and 311.08 is: 429.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.55 : 730.74 = 311.08 : x
  2. Step 2: Convert to fraction form
    529.55/730.74 = 311.08/x
  3. Step 3: Cross multiply
    529.55x = 730.74 × 311.08
  4. Step 4: Simplify right side
    529.55x = 227,322.05
  5. Step 5: Solve for x
    x = 227,322.05/529.55
  6. Step 6: Final answer
    x = 429.28

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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.