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Finding the Fourth Proportional to 476.94, 715.61 and 257.31

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Solution

The fourth proportional to 476.94, 715.61 and 257.31 is: 386.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.94 : 715.61 = 257.31 : x
  2. Step 2: Convert to fraction form
    476.94/715.61 = 257.31/x
  3. Step 3: Cross multiply
    476.94x = 715.61 × 257.31
  4. Step 4: Simplify right side
    476.94x = 184,132.46
  5. Step 5: Solve for x
    x = 184,132.46/476.94
  6. Step 6: Final answer
    x = 386.07

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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.