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Finding the Fourth Proportional to 528.19, 728.90 and 307.16

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Solution

The fourth proportional to 528.19, 728.90 and 307.16 is: 423.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.19 : 728.90 = 307.16 : x
  2. Step 2: Convert to fraction form
    528.19/728.90 = 307.16/x
  3. Step 3: Cross multiply
    528.19x = 728.90 × 307.16
  4. Step 4: Simplify right side
    528.19x = 223,887.63
  5. Step 5: Solve for x
    x = 223,887.63/528.19
  6. Step 6: Final answer
    x = 423.88

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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.