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Finding the Fourth Proportional to 381.15, 526.29 and 307.80

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Solution

The fourth proportional to 381.15, 526.29 and 307.80 is: 425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.15 : 526.29 = 307.80 : x
  2. Step 2: Convert to fraction form
    381.15/526.29 = 307.80/x
  3. Step 3: Cross multiply
    381.15x = 526.29 × 307.80
  4. Step 4: Simplify right side
    381.15x = 161,992.06
  5. Step 5: Solve for x
    x = 161,992.06/381.15
  6. Step 6: Final answer
    x = 425.01

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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.