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Finding the Fourth Proportional to 387.02, 580.40 and 155.85

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Solution

The fourth proportional to 387.02, 580.40 and 155.85 is: 233.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.02 : 580.40 = 155.85 : x
  2. Step 2: Convert to fraction form
    387.02/580.40 = 155.85/x
  3. Step 3: Cross multiply
    387.02x = 580.40 × 155.85
  4. Step 4: Simplify right side
    387.02x = 90,455.34
  5. Step 5: Solve for x
    x = 90,455.34/387.02
  6. Step 6: Final answer
    x = 233.72

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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.