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Finding the Fourth Proportional to 528.02, 728.68 and 306.98

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Solution

The fourth proportional to 528.02, 728.68 and 306.98 is: 423.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.02 : 728.68 = 306.98 : x
  2. Step 2: Convert to fraction form
    528.02/728.68 = 306.98/x
  3. Step 3: Cross multiply
    528.02x = 728.68 × 306.98
  4. Step 4: Simplify right side
    528.02x = 223,690.19
  5. Step 5: Solve for x
    x = 223,690.19/528.02
  6. Step 6: Final answer
    x = 423.64

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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.