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Finding the Fourth Proportional to 387.40, 580.37 and 240.69

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Solution

The fourth proportional to 387.40, 580.37 and 240.69 is: 360.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.40 : 580.37 = 240.69 : x
  2. Step 2: Convert to fraction form
    387.40/580.37 = 240.69/x
  3. Step 3: Cross multiply
    387.40x = 580.37 × 240.69
  4. Step 4: Simplify right side
    387.40x = 139,686.96
  5. Step 5: Solve for x
    x = 139,686.96/387.40
  6. Step 6: Final answer
    x = 360.58

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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.