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Finding the Fourth Proportional to 477.42, 715.22 and 257.50

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Solution

The fourth proportional to 477.42, 715.22 and 257.50 is: 385.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.42 : 715.22 = 257.50 : x
  2. Step 2: Convert to fraction form
    477.42/715.22 = 257.50/x
  3. Step 3: Cross multiply
    477.42x = 715.22 × 257.50
  4. Step 4: Simplify right side
    477.42x = 184,169.15
  5. Step 5: Solve for x
    x = 184,169.15/477.42
  6. Step 6: Final answer
    x = 385.76

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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.