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Finding the Fourth Proportional to 528.09, 728.60 and 307.00

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Solution

The fourth proportional to 528.09, 728.60 and 307.00 is: 423.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.09 : 728.60 = 307.00 : x
  2. Step 2: Convert to fraction form
    528.09/728.60 = 307.00/x
  3. Step 3: Cross multiply
    528.09x = 728.60 × 307.00
  4. Step 4: Simplify right side
    528.09x = 223,675.02
  5. Step 5: Solve for x
    x = 223,675.02/528.09
  6. Step 6: Final answer
    x = 423.56

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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.