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Finding the Fourth Proportional to 388.02, 581.90 and 156.85

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Solution

The fourth proportional to 388.02, 581.90 and 156.85 is: 235.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.02 : 581.90 = 156.85 : x
  2. Step 2: Convert to fraction form
    388.02/581.90 = 156.85/x
  3. Step 3: Cross multiply
    388.02x = 581.90 × 156.85
  4. Step 4: Simplify right side
    388.02x = 91,271.02
  5. Step 5: Solve for x
    x = 91,271.02/388.02
  6. Step 6: Final answer
    x = 235.22

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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.