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Finding the Fourth Proportional to 528.07, 728.79 and 307.02

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Solution

The fourth proportional to 528.07, 728.79 and 307.02 is: 423.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.07 : 728.79 = 307.02 : x
  2. Step 2: Convert to fraction form
    528.07/728.79 = 307.02/x
  3. Step 3: Cross multiply
    528.07x = 728.79 × 307.02
  4. Step 4: Simplify right side
    528.07x = 223,751.45
  5. Step 5: Solve for x
    x = 223,751.45/528.07
  6. Step 6: Final answer
    x = 423.71

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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.