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Finding the Fourth Proportional to 360.65, 540.70 and 257.87

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Solution

The fourth proportional to 360.65, 540.70 and 257.87 is: 386.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.65 : 540.70 = 257.87 : x
  2. Step 2: Convert to fraction form
    360.65/540.70 = 257.87/x
  3. Step 3: Cross multiply
    360.65x = 540.70 × 257.87
  4. Step 4: Simplify right side
    360.65x = 139,430.31
  5. Step 5: Solve for x
    x = 139,430.31/360.65
  6. Step 6: Final answer
    x = 386.61

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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.