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Finding the Fourth Proportional to 399, 598.72 and 155.46

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Solution

The fourth proportional to 399, 598.72 and 155.46 is: 233.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    399 : 598.72 = 155.46 : x
  2. Step 2: Convert to fraction form
    399/598.72 = 155.46/x
  3. Step 3: Cross multiply
    399x = 598.72 × 155.46
  4. Step 4: Simplify right side
    399x = 93,077.01
  5. Step 5: Solve for x
    x = 93,077.01/399
  6. Step 6: Final answer
    x = 233.28

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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.