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Finding the Fourth Proportional to 381.20, 525.70 and 307.48

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Solution

The fourth proportional to 381.20, 525.70 and 307.48 is: 424.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.20 : 525.70 = 307.48 : x
  2. Step 2: Convert to fraction form
    381.20/525.70 = 307.48/x
  3. Step 3: Cross multiply
    381.20x = 525.70 × 307.48
  4. Step 4: Simplify right side
    381.20x = 161,642.24
  5. Step 5: Solve for x
    x = 161,642.24/381.20
  6. Step 6: Final answer
    x = 424.04

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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.