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Finding the Fourth Proportional to 477.56, 715.62 and 385.76

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Solution

The fourth proportional to 477.56, 715.62 and 385.76 is: 578.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.56 : 715.62 = 385.76 : x
  2. Step 2: Convert to fraction form
    477.56/715.62 = 385.76/x
  3. Step 3: Cross multiply
    477.56x = 715.62 × 385.76
  4. Step 4: Simplify right side
    477.56x = 276,057.57
  5. Step 5: Solve for x
    x = 276,057.57/477.56
  6. Step 6: Final answer
    x = 578.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.